1. NICT report on intercalibration of high-energy electron sensors onboard Himawari Presented to CGMS-45 Space Weather Task Team Meeting, agenda item SWTT/5

2. Energetic Electron Sensor Intercalibration Workshop 2:00 – 4:30 pm, Monday, May 1, 2017
The electron sensor intercalibration workshop will be an opportunity to give informal presentations and have discussions on recent efforts to intercalibrate electron measurements and challenges encountered. Calibration activities with NOAA's GOES satellites, JMA's Himawari-8 satellite, and European Space Agency satellites are among those that will be discussed. The challenge of converting limited measurements to energy and pitch angle spectra for use in numerical models will also be discussed. If you plan to participate, please contact Elsayed Talaat and Terry Onsager

3. Inter-calibration between Himawari-8/SEDA and Himawari-9/SEDA
Overview – NICT report on intercalibration of high-energy electron sensors onboard Himawari
Introduction
Inter-calibration between Himawari-8/SEDA and Himawari-9/SEDA
Inter-calibration between Himawari-8/SEDA and GOES 15 particle detector
Distribution of high energy electron flux in GEO from several meteorological satellites
Conclusions

5. Energetic particle monitoring over Japan by the Japan meteorological satellite, Himawari-8, -9
Instrument: SEDA（Space Environment Data Acquisition monitor）
Purposes: house-keeping and failure analysis
Launch: 2014/10/07 (Himawari-8), 2016/11/02 (Himawari-9)
Longitude: ~140 deg.
Near-real time SEDA data is archived at NICT.
electron sensors
Electrons: 8 ch. (8 series plate)
Protons: 8 ch. (8 sensors)
Electrons: 0.2 MeV ~ 5 MeV
Protons: 15 MeV ~ 100 MeV
Electron sensor: ± 78.3°
Proton sensor: ± 39.35°
Time resolution: 10 s
proton sensors

6. Himawari/SEDA quick-look & database

7. 3-Dimensional Geospace Monitoring Network
Himawari-8/SEDA data as a source of global space environment monitoring around GEO, We wish to share space environment data obtained from other meteorlorogical satellites.
GOES 13
(NOAA)
Van Allen Probes
(NASA)
AC Mag.
GOES 15
(NOAA)
HF radar
Kodama(DRTS)
(JAXA)
DC Mag.
Arase(ERG)(JAXA)
Japanese GEO Satellites are operated in this area.
Himawari-8 & 9 (JMA）

8. Intercalibration between Himawari-8/SEDA and Himawari-9/SEDA
SEDA-e
SEDA-p
y = Ax + B
y = Ax

9. Intercalibration between Himawari-8/SEDA and Himawari-9/SEDA

10. Finding L* conjunction period
In the inner magnetosphere, charged particles drift along the drift shell of Earth’s magnetosphere. The drift shell is parameterized as Roderer’s L (L*) parameter. Information on L* is used as a clue to find the conjunction of particle observations at different longitudes of GEO.
Magnetic midnight and noon should be avoid because of drift-shell splitting effect [Friedel et al., 2005]

11. Inter-calibration between Himawari-8/SEDA and GOES 15 particle detector
There are good correlations between Himawari-8 and GOES 15 observations in general. However, the flux level is slightly lower than that observed by GOES 15 in these channels.

12. Distribution of high energy electron flux in GEO from several meteorological satellites

13. Conclusions (1)
The comparison of high-energy electron fluxes between Himawari-8/SEDA and Himawari-9/SEDA showed fairly good correspondence with only a minor offset. The offset caused by the subtraction error of bias current will be improved in the near future.
To compare high-energy electron fluxes between Himawari-8/SEDA and GOES 15/MAGED, the drift shell parameter L* was estimated to find a conjunction period. The cross-comparison between Himawari-8/SEDA and GOES 15/MAGED showed good correspondence, and the flux level of Himawari-8/SEDA was found to be smaller than that of GOES 15/MAGED.

14. Conclusions (2)
The product of the estimated high-energy electron flux distribution along GEO was obtained using calibrated particle data. We are planning to provide this type of product in near real time using the near-real-time data stream from Himawari, DSCOVR, and GOES.
The monitoring of a high-energy particle environment in GEO will be improved if additional data from space-based observation in GEO can be included. In addition, the area of the high-energy electron flux distribution will be expanded from GEO to the whole inner magnetospheric region by using the near-real-time data stream of NASA’s Van-Allen Probes and JAXA’s Arase satellite.