CALET measurements of cosmic ray electrons in the heliosphere

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

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 approved for the phase A study by the Japan Aerospace Exploration Agency (JAXA). In this paper we present the purposes of the CALET mission pertaining to solar physics and expected results from measurements of electrons in the 1-100GeV energy range. Cosmic rays in this energy region are largely modulated by solar activity and their intensity has both long-term and short-term variations. Measuring such variations precisely will give new information about the transport of cosmic rays in the heliosphere. We estimate the energy dependence of the diffusion of cosmic rays through the solar magnetic field and verify some transport models. Electrons in this energy range are mostly negative though CALET does not distinguish the sign of charges directly. We therefore investigate the charge sign dependence of variations using a correlation between the electron intensity and the neutron monitor counting rate, which indicates the variation of proton intensity. We also expect to detect Forbush decreases in the electron flux. In such decreases, short-term variations of negative charges might differ from those of positive ones.

Original languageEnglish
Pages (from-to)188-191
Number of pages4
JournalJournal of the Physical Society of Japan
Volume78
Issue numberSUPPL. A
Publication statusPublished - 2009

Fingerprint

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

Keywords

  • Cosmic ray
  • Electron
  • Forbush decrease
  • ISS
  • JEM
  • Solar modulation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Komori, Y., Torii, S., Shimizij, Y., Tamura, T., Yoshida, K., Terasawa, T., & Munakata, K. (2009). CALET measurements of cosmic ray electrons in the heliosphere. Journal of the Physical Society of Japan, 78(SUPPL. A), 188-191.

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

In: Journal of the Physical Society of Japan, Vol. 78, No. SUPPL. A, 2009, p. 188-191.

Research output: Contribution to journalArticle

Komori, Y, Torii, S, Shimizij, Y, Tamura, T, Yoshida, K, Terasawa, T & Munakata, K 2009, 'CALET measurements of cosmic ray electrons in the heliosphere', Journal of the Physical Society of Japan, vol. 78, no. SUPPL. A, pp. 188-191.
Komori Y, Torii S, Shimizij Y, Tamura T, Yoshida K, Terasawa T et al. CALET measurements of cosmic ray electrons in the heliosphere. Journal of the Physical Society of Japan. 2009;78(SUPPL. A):188-191.
Komori, Yoshiko ; Torii, Shoji ; Shimizij, Yuki ; Tamura, Tadahisa ; Yoshida, Kenji ; Terasawa, Toshio ; Munakata, Kazuoki. / CALET measurements of cosmic ray electrons in the heliosphere. In: Journal of the Physical Society of Japan. 2009 ; Vol. 78, No. SUPPL. A. pp. 188-191.
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