Precipitating Electrons Observed on Board the Japanese Antarctic Sounding Rockets S-310JA-1 and S-310JA-2

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Cylindrical electrostatic analyzers on board the Japanese Antarctic sounding rockets S-310JA-1 and S-310JA-2 launched on February 13,1976 and on February 10,1977,respectively, at Syowa Station, obtained the energy spectra of energetic electrons in the Antarctic polar ionosphere. At the time of the former flight, the geomagnetic activity was low, and the electron flux of about (10)^3 electrons/(cm)^2・sec・ster・eV was obtained at an energy of 5keV. The altitude dependence of the flux of 2keV electrons showed the maximum flux near 150km altitude of the descending path. This implies that there was a local electron precipitation region. At the time of the latter flight, the geomagnetic activity was high, and the electron flux of about 1.8×(10)^3 electrons/(cm)^2・sec・ster・eV was obtained at the energy of 4.2keV. The field aligned electron flux of about 2.3×(10)^4 electrons/(cm)^2・sec・ster・eV was also observed at the energy of 740eV.
国立極地研究所の論文