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====== Level-2 pre Data Product ======
===== Abbreviation =====
sc = science, l2p = Level-2 pre, l2 = Level-2, l = L-mode, mass = Mass accumulation mode, cnt = Count accumulation mode, np = number of spin phase bins, nm = number of mass bins

===== L (Low data rate) mode =====

==== Mass accumulation mode ====

The Level-2 pre data products (Level-2 pre CDF data files) are generated for each combination of spin phase bins and mass bins (''np'' x ''nm'') in the Mass accumulation mode. As a result, 20 data products/CDF files are provided for this mode.

  * **File naming convention**: bc-mmo-mppe_cal_sc_ena_l2p-l-mass-np''PP''-nm''MM''_''yyyymmdd''_r''XX''-v''YY''-''ZZ''.cdf
    * ''PP'' = 01, 02, 04, 08, 16
    * ''MM'' = 01, 02, 04, 08
    * ''yyyymmdd'' = (year) + (month) + (day)
    * ''XX'', ''YY'', ''ZZ'' = release, major, monior numbers

^ Variable                      ^ Description                                                                                                   ^ Data type        ^ Data type in IDL  ^ Dimension                                               ^ Unit                           ^ Time resolution                                                    ^ Remarks                                                                                 ^
| epoch                         | Time labels in the CDF_TT2000 format                                                                          | CDF_TIME_TT2000  | LONG64            | [time]                                                  | ns                             | ~4 * (''num_add_interval_Spin'' in the observation mode flag) [s]  |                                                                                         |
| strtime                       | Time labels in UTC string                                                                                     | CDF_CHAR         | STRING            | [time]                                                  | UTC                            | :::                                                                | "YYYY-MM-DDThh:mm:ss.ffffffZ"                                                           |
| time_width                    | Data accumulation period in second                                                                            | CDF_REAL4        | FLOAT             | [time]                                                  | s                              | :::                                                                |                                                                                         |
| mdp_ti                        | Time indicators (TIs) given by Mission Data Processor (MDP)                                                   | CDF_UNIT4        | ULONG             | [time]                                                  | NA                             | :::                                                                |                                                                                         |
| c_cnt_tot                     | Total coincident count                                                                                        | CDF_REAL4        | FLOAT             | [time x spin phase x energy]                            | counts/sample                  | :::                                                                |                                                                                         |
| sta_cnt_tot                   | Total start sector raw count                                                                                  | CDF_REAL4        | FLOAT             | [time x spin phase x energy]                            | counts/sample                  | :::                                                                |                                                                                         |
| sto_cnt_tot                   | Total stop sector raw count                                                                                   | CDF_REAL4        | FLOAT             | [time x spin phase x energy]                            | counts/sample                  | :::                                                                |                                                                                         |
| InvalidTOF_CNT                | Invalid TOF count                                                                                             | CDF_REAL4        | FLOAT             | [time x spin phase x energy]                            | counts/sample                  | :::                                                                |                                                                                         |
| c_sta_cnt                     | Coincident start sector count                                                                                 | CDF_REAL4        | FLOAT             | [time x spin phase x energy x start sector]             | counts/sample                  | :::                                                                |                                                                                         |
| c_sto_cnt                     | Coincident stop sector count                                                                                  | CDF_REAL4        | FLOAT             | [time x spin phase x energy x stop sector]              | counts/sample                  | :::                                                                |                                                                                         |
| c_cnt                         | Coincident count                                                                                              | CDF_REAL4        | FLOAT             | [time x spin phase x energy x start sector x mass bin]  | counts/sample                  | :::                                                                |                                                                                         |
| uncorrected_flux              | Uncorrected differential number flux                                                                          | CDF_REAL4        | FLOAT             | [time x spin phase x energy x start sector x mass bin]  | counts/s/cm<sup>2</sup>/eV/sr  | :::                                                                | This variable would be filled with the fill value/NaN in a later calibration phase.     |
| corrected_flux                | Corrected differential number flux                                                                            | CDF_REAL4        | FLOAT             | [time x spin phase x energy x start sector x mass bin]  | counts/s/cm<sup>2</sup>/eV/sr  | :::                                                                | This variable would be filled with the fill value/NaN in an initial calibration phase.  |
| spin_phase_index              | Index of spin phase (1, 2, ..., np)                                                                           | CDF_INT2         | INT               | [spin phase]                                            | NA                             | :::                                                                | This variable is prepared to define an axis in a PDS4 label.                            |
| energy                        | Central energy of logarithmic energy steps                                                                    | CDF_REAL4        | FLOAT             | [energy]                                                | eV                             | :::                                                                |                                                                                         |
| energy_range                  | Upper and lower limits of energy steps                                                                        | CDF_REAL4        | FLOAT             | [energy x 2(lower, upper)]                              | eV                             | :::                                                                |                                                                                         |
| start_sector_index            | Index of start sector (0, 1, ..., 6)                                                                          | CDF_INT2         | INT               | [start sector]                                          | NA                             | :::                                                                | This variable is prepared to define an axis in a PDS4 label.                            |
| stop_sector_index             | Index of stop sector (0, 1, ..., 7)                                                                           | CDF_INT2         | INT               | [stop sector]                                           | NA                             | :::                                                                | This variable is prepared to define an axis in a PDS4 label.                            |
| mass_index                    | Index of mass bins (0, 1, ..., nm)                                                                            | CDF_INT2         | INT               | [mass bin]                                              | NA                             | :::                                                                | This variable is prepared to define an axis in a PDS4 label.                            |
| azimuth                       | Azimuthal angles of the directional counts/flux in a coordinate system fixed to the spinning satellite body   | CDF_REAL4        | FLOAT             | [start sector]                                          | degree                         | :::                                                                |                                                                                         |
| elevation                     | Eleveation angles of the directional counts/flux in a coordinate system fixed to the spinning satellite body  | CDF_REAL4        | FLOAT             | [start sector]                                          | degree                         | :::                                                                |                                                                                         |
| quality_flag (**tentative**)  | Data quality flags                                                                                            | CDF_INT2         | INT               | [time]                                                  | NA                             | :::                                                                | Details are shown below.                                                                |
| mode_flag                     | Observation mode flags                                                                                        | CDF_INT2         | INT               | [time x 18]                                             | NA                             | :::                                                                | Details are shown below.                                                                |

----

==== Count accumulation mode ====

The Level-2 data products (Level-2 pre CDF data files) are generated for each spin phase bin (''np'') in the Count accumulation mode. As a result, 5 data products/CDF files are provided for this mode.

  * **File naming convention**: bc-mmo-mppe_cal_sc_ena_l2p-l-cnt-np''PP''_''yyyymmdd''_r''XX''-v''YY''-''ZZ''.cdf
    * ''PP'' = 01, 02, 04, 08, 16
    * ''yyyymmdd'' = (year) + (month) + (day)
    * ''XX'', ''YY'', ''ZZ'' = release, major, monior numbers

^ Variable                      ^ Description                                                                                                                                                                  ^ Data type        ^ Data type in IDL  ^ Dimension                                                 ^ Unit                           ^ Time resolution                                                    ^ Remarks                                                                                 ^
| epoch                         | Time labels in the CDF_TT2000 format                                                                                                                                         | CDF_TIME_TT2000  | LONG64            | [time]                                                    | ns                             | ~4 * (''num_add_interval_Spin'' in the observation mode flag) [s]  |                                                                                         |
| strtime                       | Time labels in UTC string                                                                                                                                                    | CDF_CHAR         | STRING            | [time]                                                    | UTC                            | :::                                                                | "YYYY-MM-DDThh:mm:ss.ffffffZ"                                                           |
| time_width                    | Data accumulation period in second                                                                                                                                           | CDF_REAL4        | FLOAT             | [time]                                                    | s                              | :::                                                                |                                                                                         |
| mdp_ti                        | Time indicators (TIs) given by Mission Data Processor (MDP)                                                                                                                  | CDF_UNIT4        | ULONG             | [time]                                                    | NA                             | :::                                                                |                                                                                         |
| sta_s_cnt                     | Start sector raw count                                                                                                                                                       | CDF_REAL4        | FLOAT             | [time x spin phase x energy x start sector x start ring]  | counts/sample                  | :::                                                                |                                                                                         |
| tot_sta_r_cnt                 | Total start ring raw count                                                                                                                                                   | CDF_REAL4        | FLOAT             | [time x spin phase x energy x start ring]                 | counts/sample                  | :::                                                                |                                                                                         |
| tot_sta_s_cnt                 | Total start sector raw count                                                                                                                                                 | CDF_REAL4        | FLOAT             | [time x spin phase x energy x xstart sector]              | counts/sample                  | :::                                                                |                                                                                         |
| tot_sto_s_cnt                 | Total stop sector raw count                                                                                                                                                  | CDF_REAL4        | FLOAT             | [time x spin phase x energy x stop sector]                | counts/sample                  | :::                                                                |                                                                                         |
| c_sta_s_cnt                   | Coincident start sector count                                                                                                                                                | CDF_REAL4        | FLOAT             | [time x spin phase x energy x start sector]               | counts/sample                  | :::                                                                |                                                                                         |
| c_sto_s_cnt                   | Coincident stop sector count                                                                                                                                                 | CDF_REAL4        | FLOAT             | [time x spin phase x energy x stop sector]                | counts/sample                  | :::                                                                |                                                                                         |
| uncorrected_flux              | Uncorrected differential number flux. This varialbe is NOT intended for scientific use. The coincident count / corrected flux data are recommended for scientific analysis.  | CDF_REAL4        | FLOAT             | [time x spin phase x energy x start sector]               | counts/s/cm<sup>2</sup>/eV/sr  | :::                                                                | This variable would be filled with the fill value/NaN in a later calibration phase.     |
| corrected_flux                | Corrected differential number flux                                                                                                                                           | CDF_REAL4        | FLOAT             | [time x spin phase x energy x start sector]               | counts/s/cm<sup>2</sup>/eV/sr  | :::                                                                | This variable would be filled with the fill value/NaN in an initial calibration phase.  |
| spin_phase_index              | Index of spin phase (0, 1, ..., np)                                                                                                                                          | CDF_INT2         | INT               | [spin phase]                                              | NA                             | :::                                                                | This variable is prepared to define an axis in a PDS4 label.                            |
| energy                        | Central energy of logarithmic energy steps                                                                                                                                   | CDF_REAL4        | FLOAT             | [energy]                                                  | eV                             | :::                                                                |                                                                                         |
| energy_range                  | Upper and lower limits of energy steps                                                                                                                                       | CDF_REAL4        | FLOAT             | [energy x 2(lower, upper)]                                | eV                             | :::                                                                |                                                                                         |
| start_sector_index            | Index of start sector (0, 1, ..., 6)                                                                                                                                         | CDF_INT2         | INT               | [start sector]                                            | NA                             | :::                                                                | This variable is prepared to define an axis in a PDS4 label.                            |
| stop_sector_index             | Index of stop sector (0, 1, ..., 7)                                                                                                                                          | CDF_INT2         | INT               | [stop sector]                                             | NA                             | :::                                                                | This variable is prepared to define an axis in a PDS4 label.                            |
| start_ring_index              | Index of start ring (0, 1, ..., 3)                                                                                                                                           | CDF_INT2         | INT               | [start ring]                                              | NA                             | :::                                                                | This variable is prepared to define an axis in a PDS4 label.                            |
| azimuth                       | Azimuthal angles of the directional counts/flux in a coordinate system fixed to the spinning satellite body                                                                  | CDF_REAL4        | FLOAT             | [start sector]                                            | degree                         | :::                                                                |                                                                                         |
| elevation                     | Eleveation angles of the directional counts/flux in a coordinate system fixed to the spinning satellite body                                                                 | CDF_REAL4        | FLOAT             | [start sector]                                            | degree                         | :::                                                                |                                                                                         |
| quality_flag (**tentative**)  | Data quality flags                                                                                                                                                           | CDF_INT2         | INT               | [time]                                                    | NA                             | :::                                                                | Details are shown below.                                                                |
| mode_flag                     | Observation mode flags                                                                                                                                                       | CDF_INT2         | INT               | [time x 18]                                               | NA                             |                                                                    | Details are shown below.                                                                |



----

==== Flag definition ====

Data quality flags (''quality_flag'') are tentatively defined as follows.
The PWI team has been considering a common part of the data quality flags for all instruments (b0-b7).

^ Bit           ^ Description       ^ Definition               ^ Remarks                          ^
| b0            | See Quality Note  | 0:, 1: see Quality-Note  | on MPPE-Wiki                     |
| b1            | Eclipse           | 0:, 1: eclipse           |                                  |
| b2            | Maneuver          | 0:, 1: maneuver          |                                  |
| b3            | MTQ               | 0:, 1: MTQ on            |                                  |
| b4            |                   |                          | Reserved for common flags        |
| b5            |                   |                          | Reserved for common flags        |
| b6            |                   |                          | Reserved for common flags        |
| b7            |                   |                          | Reserved for common flags        |
^ ENA specific  ^                   ^                          ^                                  ^
| b8            | HV on/off         | 0: HV on, 1: HV off      |                                  |
| b9            | CAL               | 0:, 1: CAL               |                                  |
| b10           |                   |                          | Reserved for ENA specific flags  |
| b11           |                   |                          | Reserved for ENA specific flags  |
| b12           |                   |                          | Reserved for ENA specific flags  |
| b13           |                   |                          | Reserved for ENA specific flags  |
| b14           |                   |                          | Reserved for ENA specific flags  |
| b15           |                   |                          | Reserved for ENA specific flags  |

Observation mode flags (''mode_flag'') are tentatively defined as follows:
^ Index  ^ Description                                                                                            ^ Definition                                                                                                                                                                                                                                                                                                                                                                                                                                                ^ Remarks  ^
| 0      | numE (number of energy bin)                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 1      | numC (number of channel bin (START SECTOR))                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 2      | numM (number of mass bin)                                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 3      | numP (number of phase bin (of output data matrix))                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 4      | numP0 (number of phase bin in internal calculation)                                                    | numP0 = 0x20: energy step 0 (E0) = E4, E1 = E5, E2 = E6, E3 = E7 when numE = 4 \\ E0 = E1 = E4 = E5, E2 = E3 = E6 = E7 when numE = 2 \\ numP0 != 0x20: E0 = E1, E2 = E3, E4 = E5, E6 = E7 when numE = 4 \\ E0 = E1 = E2 = E3, E4 = E5 = E6 = E7 when numE = 2                                                                                                                                                                                             |          |
| 5      | startP (slotID/4 of data processing start)                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 6      | lenP (number of slots/4 in which data are processed (others are just ignored))                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 7      | cntoffset (Offset of count which is subtracted from count data at LinLog compression )                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 8      | SVramID (ID of selected SV table )                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 9      | cntdepth (Depth of count which is referred at LinLog compression)                                      | 0: 32bit, 1: 16bit, 2: 12bit                                                                                                                                                                                                                                                                                                                                                                                                                              |          |
| 10     | num_add_interval_Spin (Number of spin accumulation)                                                    | Number of spin = 2<sup>                                                                                                                                                                                                                                                                                           (addSpin)</sup>, where addSpin is an encoded number of spin in which data are added. (ACCUMMASS, ACCUMCNT, ACCUMTOF modes               |          |
| 11     | numProcessPckt_inSpin (b in DV17 (applicable for IFE_ENGINEERING, IFE_TABLEREAD, NON-PROCESS modes) )  | 0: 1 of 16 packets in one S/C spin are sent (sent packet: packet 0) \\ 1: 2 of 16 packets in one S/C spin are sent (sent packet: packet 0, 8) \\ 2: 4 of 16 packets in one S/C spin are sent (sent packet: packet 0, 4, 8, 12) \\ 3: 8 of 16 packets in one S/C spin are sent (sent packet: packet 0, 2, 4, 6, 8, 10, 12, 14) \\ 4: 16 of 16 packets in one S/C spin are sent (sent packet: packet 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)  |          |
| 12     | adisSENA                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 13     | adisSTBL                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 14     | adisSSTEP                                                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 15     | adisMENA                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 16     | adisMTBL                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |
| 17     | adisMStep                                                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                           |          |

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