Solar variability observed with GMS/SEM

Computer Science – Sound

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High Energy Electrons, Satellite Sounding, Solar Activity, Solar Electrons, Solar Protons, Variability, Aerospace Environments, Japanese Spacecraft, Magnetically Trapped Particles, Proton Energy

Scientific paper

Daily averaged data on energetic protons, alpha particles, and electrons obtained between 1978-1986 with different channels of SEM aboard the Geostationary Meteorological Satellite 'Himawari' are presented and discussed. Most solar particle events (SPEs), observed in the P2-P6 and A1-A5 channels, show a gradual rise and a further gradual decay of the particle fluxes, although some SREs displayed a sharp rise and a gradual decay. SPEs, which occurred frequently in the 1978-1979 and 1981-1982 periods, were less frequent after 1983; however, there occurred several large and energetic SREs between 1983 and 1986. Therefore, the long-term trend in the high-energy particle ejection from the sun is quite different from that in the sunspot number. The fluxes from the EL and P1 channel response, largely due to energetic particles trapped in the earth's magnetic field, show substorm-induced variations, the characteristics of which depend highly on local time.

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