Solar Modulation of Galactic Cosmic-Ray Electrons Measured with CALET

The CALET Collaboration

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The CALorimetric Electron Telescope (CALET) installed on the International Space Station has multiple event trigger modes for measuring high-energy particles and gamma rays. The observations of the low-energy cosmic-ray (CR) electrons (electrons + positrons) in an energy region from 1 GeV to 10 GeV have been successfully performed by a low-energy shower trigger mode working in the geomagnetic polar regions. The continuous measurements of the low-energy CR electrons may provide a crucial key to the understanding of the solar modulation of the galactic cosmic rays. Here we have analyzed the low-energy CR electrons measured by CALET over the past three years to investigate the solar modulation of the CR electrons. We have obtained the continuous variation of the low-energy electron flux increasing as time passes, which have been expected from a recent weakening solar cycle. We have also confirmed that there are additional small fluctuations in the flux, that has a potential to be explained by the effects of the interplanetary coronal mass ejections or the co-rotating interaction region of the solar wind.

Original languageEnglish
Article number1126
JournalProceedings of Science
Publication statusPublished - 2021 Jul 2
Event36th International Cosmic Ray Conference, ICRC 2019 - Madison, United States
Duration: 2019 Jul 242019 Aug 1

ASJC Scopus subject areas

  • General


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