†  Announcement of HEP Level-3 CDF files

  • We, the ERG/HEP team, are pleased to announce that the new HEP Level-3 pitch-angle sorted flux data are now available from the ERG-SC website. The newly released data have the version number of v01_00. The data are generated from HEP Level-2 3-D flux data by sorting them with pitch angle values based on MGF Level-2 8 sec data. In obtaining average fluxes for pitch angle bins, only electron fluxes for azimuthal channels of 1, 2, 3, 6, 7, 8, 12, and 13 and for spin sectors #1, #2, ..., #14 (excluding spin sectors #0 and #15) were used in order to avoid effects of the imperfect flux normalization in Level-2 3-D flux data. Consequently, the derived pitch-angle spectra are equivalent to those that one can calculate using the part_products routine. Flux values in the Level-3 data have been averaged for 8 satellite spins (~ 64 sec) to get smooth spectra over pitch angle.

    The Level-3 data are going to be made publicly available with a 1-year latency.

    For SPEDAS users, the latest version of erg_load_hep.pro bundled in the ERG-SC plug-in for SPEDAS can be used to load Level-3 data. Copied below are some sample commands.

    IDL> erg_init
    ERG> timespan, '2019-08-06'
    ERG> erg_load_hep, level='l3', uname='****', pass='****'
    (please pass the ERG project team ID/password through uname and pass)

    HEP Level-3 data archived in the CDF format are available online from the ERG-SC data repository at:

    The latest update and information on the instrument and data can also be found in the wiki page at:

    The ERG project asks all data users to show which version of data were used for his/her studies. This information should be included in, for example, the acknowledgment section of scientific papers in which ERG (Arase) satellite data are used.

    The project also asks you to read carefully and follow the rules of the road (RoR) when you use the data for your own research. The latest RoR for the HEP and MGF data are copied at the end of this announcement. As the RoR reads, please contact the HEP and MGF teams (erg_hep_info [at] isee.nagoya-u.ac.jp, erg_mgf_info [at] isee.nagoya-u.ac.jp) before using the data for any publications and presentations.

    T. Mitani (HEP PI), T. Takashima (HEP Co-I), A. Matsuoka (MGF PI) T. Hori (ERG-SC contact for HEP data) Y. Miyoshi (project scientist), I. Shinohara (project manager)

    Rules of the Road for the users of the products from the ERG/Arase Project

    1. Users of all level of scientific products from the ERG/Arase project should contact instrument PI team(s), Project Manager (PM), and Project Scientist (PS) before using the data for any presentation and publication. PI(s) / PM (Iku Shinohara, iku at stp.isas.jaxa.jp) / PS (Yoshizumi Miyoshi, miyoshi at isee.nagoya-u.ac.jp) may suggest potential coauthor(s) from the ERG/Arase project side for the presentation and publication. Some necessary articles suggested by the PI(s) should be cited.

    2. Users should always use the latest version of data files in CDF provided from the ERG science center for their data analysis, presentation and publications. Redistribution of the data files is strictly prohibited.

    3. Users should send presentation materials and papers including ERG/Arase data to instrument PI team(s), PM, and PS enough before presentation and paper submission, so that sufficient time is available for those responsible for the data to check if the data are properly processed/used and to get necessary comments back to the data users.

    4. Publications that use ERG/Arase satellite data should cite the project overview paper (Miyoshi et al., Earth Planets Space, DOI:10.1186/s40623-018-0862-0, 2018a) and include the following text in the paper acknowledgements:

    "Science data of the ERG (Arase) satellite were obtained from the ERG Science Center operated by ISAS/JAXA and ISEE/Nagoya University (https://ergsc.isee.nagoya-u.ac.jp/index.shtml.en, Miyoshi et al., 2018b). The present study analyzed MGF-L2 v01_01 data, HEP-L2 v03_01 data, MEP-e-L2 v01_01 data, and Orbit L3 v02 data"

    Miyoshi et al., Earth Planets Space, DOI:10.1186/s40623-018-0867-8, 2018b

    Rules of the Road of HEP Level 2 data

    For details of the instrument, please refer to the following article: Mitani, T., et al. (2018), High-energy electron experiments (HEP) aboard the ERG (Arase) satellite, Earth, Planets and Space, 70:77, doi:10.1186/s40623-018-0853-1.

    The users should be aware that the current version of Level-2 data may still contain contamination to flux values due to penetration of higher energy electrons and protons. The users should analyze data carefully not only for quantitative studies but also qualitative examination.It is highly recommended to establish contact and work together with the PI team from the early stage of the user's study.

    Level-2 data can be updated in future if necessary. Please make sure to use the latest version of data for the analyses.

    Further information on the data can be found at the following wiki page: https://ergsc.isee.nagoya-u.ac.jp/mw/index.php/ErgSat/Hep Questions, comments, and any feedback relevant to the data should be directed to the HEP team (E-mail: erg_hep_info at isee.nagoya-u.ac.jp).

    Rules of the Road of Level-2 data (MGF)

    The MGF Level-2 data should be used based on a full understanding of the measurement limit.
    Please refer to and cite the following article: Matsuoka, A. et al. (2018), The ARASE (ERG) magnetic field investigation, Earth, Planets and Space, doi:10.1186/s40623-018-0800-1, if you use the MGF data for your research.
    Further information on the data can be found at the following wiki page: https://ergsc.isee.nagoya-u.ac.jp/mw/index.php/ErgSat/Mgf/ Questions, comments, and any feedback relevant to the data should be directed to the MGF team (PI: Ayako Matsuoka) (contact: erg_mgf_info at isee.nagoya-u.ac.jp).

    For more information, see https://ergsc.isee.nagoya-u.ac.jp/index.shtml.en

Last Modify:2020/09/14