CALET observations of cosmic ray electrons in the heliosphere

Yoshiko Komori, Shoji Torii, Tadahisa Tamura, Kenji Yoshida, Toshio Terasawa, Kazuoki Munakata

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The CALorimetric Electron Telescope (CALET) mission has been proposed to measure electrons and gamma rays in a wide energy range on the Japanese Experiment Module (JEM)/International Space Station (ISS) and the development is being carried out successfully. CALET has a large geometric factor that makes it possible to continuously and precisely measure electron intensities, and can provide statistically sufficient data for GeV energies, though the low energy measurements will be performed in a restricted time period and are severely restricted by ISS orbits. The purpose of the CALET mission pertaining to solar physics is to get new information on the cosmic ray transport in the heliosphere. We estimate the energy dependence of the diffusion of electrons through the solar magnetic field. Further we simultaneously observe electrons and protons in the 1- 10 GeV energy range and investigate the charge sign dependence of solar modulation. We also discuss some expectations in different solar polarities, using a correlation between the cosmic-ray intensity and the neutron monitor counting rate. For short-term measurements, we expect to detect several Forbush decreases in electron flux. In such decreases, shortterm variations of negative charges might differ from those of positive ones.

    Original languageEnglish
    Title of host publication31st International Cosmic Ray Conference, ICRC 2009
    PublisherUniversity of Lodz
    Publication statusPublished - 2009
    Event31st International Cosmic Ray Conference, ICRC 2009 - Lodz
    Duration: 2009 Jul 72009 Jul 15

    Other

    Other31st International Cosmic Ray Conference, ICRC 2009
    CityLodz
    Period09/7/709/7/15

    Fingerprint

    particle telescopes
    heliosphere
    cosmic rays
    International Space Station
    electrons
    energy
    Forbush decreases
    solar physics
    electron flux density
    solar magnetic field
    electron flux
    monitors
    polarity
    rays
    counting
    modules
    gamma rays
    orbits
    modulation
    neutrons

    Keywords

    • Electrons
    • ISS
    • Solar modulation

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Komori, Y., Torii, S., Tamura, T., Yoshida, K., Terasawa, T., & Munakata, K. (2009). CALET observations of cosmic ray electrons in the heliosphere. In 31st International Cosmic Ray Conference, ICRC 2009 University of Lodz.

    CALET observations of cosmic ray electrons in the heliosphere. / Komori, Yoshiko; Torii, Shoji; Tamura, Tadahisa; Yoshida, Kenji; Terasawa, Toshio; Munakata, Kazuoki.

    31st International Cosmic Ray Conference, ICRC 2009. University of Lodz, 2009.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Komori, Y, Torii, S, Tamura, T, Yoshida, K, Terasawa, T & Munakata, K 2009, CALET observations of cosmic ray electrons in the heliosphere. in 31st International Cosmic Ray Conference, ICRC 2009. University of Lodz, 31st International Cosmic Ray Conference, ICRC 2009, Lodz, 09/7/7.
    Komori Y, Torii S, Tamura T, Yoshida K, Terasawa T, Munakata K. CALET observations of cosmic ray electrons in the heliosphere. In 31st International Cosmic Ray Conference, ICRC 2009. University of Lodz. 2009
    Komori, Yoshiko ; Torii, Shoji ; Tamura, Tadahisa ; Yoshida, Kenji ; Terasawa, Toshio ; Munakata, Kazuoki. / CALET observations of cosmic ray electrons in the heliosphere. 31st International Cosmic Ray Conference, ICRC 2009. University of Lodz, 2009.
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    AU - Torii, Shoji

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    AU - Yoshida, Kenji

    AU - Terasawa, Toshio

    AU - Munakata, Kazuoki

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    AB - The CALorimetric Electron Telescope (CALET) mission has been proposed to measure electrons and gamma rays in a wide energy range on the Japanese Experiment Module (JEM)/International Space Station (ISS) and the development is being carried out successfully. CALET has a large geometric factor that makes it possible to continuously and precisely measure electron intensities, and can provide statistically sufficient data for GeV energies, though the low energy measurements will be performed in a restricted time period and are severely restricted by ISS orbits. The purpose of the CALET mission pertaining to solar physics is to get new information on the cosmic ray transport in the heliosphere. We estimate the energy dependence of the diffusion of electrons through the solar magnetic field. Further we simultaneously observe electrons and protons in the 1- 10 GeV energy range and investigate the charge sign dependence of solar modulation. We also discuss some expectations in different solar polarities, using a correlation between the cosmic-ray intensity and the neutron monitor counting rate. For short-term measurements, we expect to detect several Forbush decreases in electron flux. In such decreases, shortterm variations of negative charges might differ from those of positive ones.

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