30TH INTERNATIONAL COSMIC RAY CONFERENCE CALET measurements of cosmic ray electrons in the heliosphere

Abstract: We have proposed the CALET(CALorimetric Electron Telescope) mission to observe galac-tic electrons and gamma rays on ISS/JEM. In this paper we present the measurements of long-term and short-term variations of electron intensities in the heliosphere. Galactic electrons of 1-100 GeV energy range mostly have negative charges and the spectrum largely varies with solar activities. Thus we expect the knowledge of the diffusion coefficient of electons, especially its energy dependence, and of the effec-tiveness of propagation models or the charge sign dependence of modulation. We also expect Forbush decreases in electron flux, since the large geometric factor for CALET can compensate the low intensity of electrons. The ISS orbit severely restrict lower energy measurements, and we have to estimate in detail the variation of geomagnetic cutoff rigidity