ErgSat/Mepe

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Medium-Energy Particle Experiments - Electron Analyzer (MEP-e)

Members

  • PI
    • Satoshi Kasahara (The University of Tokyo)
  • Deputy-PI
    • Shoichiro Yokota (Osaka University)

Rules of the Road

  • For the general data policy for the ERG satellite, please refer to this webpage.

Specific to MEP-e Data

  • The data user is strongly encouraged to contact the PI in an early stage of his/her work using MEP-e data to discuss data usage and interpretation.
  • For details of the instrument, please refer to the following article:
    • Kasahara et al. (2017), Medium-Energy Particle experiments – electron analyzer (MEP-e) for the Exploration of energization and Radiation in Geospace (ERG) mission, Earth Planets and Space, in press.

Updates on the Instrument Status, Data, Calibration, and Notes

  • 20180207
    • The initial version of Level-2 3-D flux data have been released to the ERG working group.

Past articles archived here

Instrument Specifications

  • Energy range: <10 to 80 keV
  • Energy resolution: 8% (FWHM)
  • Energy steps: 16 steps per scan
  • Sensor field of view: 360° (azimuth) × 3.5° (elevation)
  • Number of detectors: 16
  • Geometric factor: 6.6×10-5 cm2 sr keV/keV per detector
  • Time resolution: ~8s for full 3-D distribution function

Scientific observation Mode

  • Normal mode
    • Count data
    • List data

Observation Mode Changes

  • March, 2017
    • The regular observations started (-present).

Calibration Information

To be described in future.

Science Data Products

AA and BB in a data file name represent the major and minor version numbers, respectively, of the data.

Level-2 data

3-D flux data (data file name: erg_mepe_l2_3dflux_YYYYMMDD_vAA_BB.cdf)
Name Description Dimension Nominal Time Resolution Data Load Routine for SPEDAS
epoch Time at the middle of spin sector #16 (time) ~8s or 16s erg_load_mepe
epoch_sp Time at the middle of each spin sector (time) ~0.25s or 0.5s erg_load_mepe
FEDU Unidirectional differential electron number flux with noises subtracted (time) x 32(spin phase) x 16(energy) x 16(APD) 8s or 16s erg_load_mepe
FEDU_n Unidirectional differential electron number flux (noise contained) (time) x 32(spin phase) x 16(energy) x 16(APD) 8s or 16s erg_load_mepe
FEEDU Unidirectional differential electron energy flux with noises subtracted (time) x 32(spin phase) x 16(energy) x 16(APD) 8s or 16s erg_load_mepe
count_raw Raw electron count (noise contained) (time) x 32(spin phase) x 16(energy) x 16(APD) 8s or 16s erg_load_mepe
FEDU_Energy Central (log-averaged) energy of energy bin 16(energy) (constant) erg_load_mepe
FEDU_Angle_sga FEDU directions in SGA coordinates 2(elev,azimuth angle) x 16(APD) (constant) erg_load_mepe
FEDU_Angle_gse FEDU directions in GSE coordinates (time) x 2(elev,azimuth angle) x 16(APD) x 32(spin phase) 8s or 16s erg_load_mepe
FEDU_quality_index Quality flag for each APD and spin phase 1byte x (time) 8s or 16s erg_load_mepe
spin_phase Spin phase number (time) ~0.25s or 0.5s erg_load_mepe
mode_reduction flag for reduction of data accumulation 2byte x (time) 8s or 16s erg_load_mepe


Omni-directional flux data (data file name: erg_mepe_l2_omniflux_YYYYMMDD_vAA_BB.cdf)
Name Description Dimension Nominal Time Resolution Data Load Routine for SPEDAS
epoch Time at the middle of spin sector #16 (time) ~8s or 16s erg_load_mepe
FEDO Omni-directional differential electron number flux with noises subtracted (time) x 16(energy) 8s or 16s erg_load_mepe
FEDO_Energy Central (log-averaged) energy of energy bin 16(energy) (constant) erg_load_mepe


Level-3 Data (TBD)
Name Description Dimension Nominal Time Resolution Data Load Routine for SPEDAS

Data Inventory (Data Archive Status)

Data repository: https://ergsc.isee.nagoya-u.ac.jp/data/ergsc/satellite/erg/mepe/

Name Processed until Latest Calibration Version Remarks