Physics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1226m&link_type=abstract
Journal of Geophysical Research Space Physics, Volume 108, Issue A6, pp. SMP 3-1, CiteID 1226, DOI 10.1029/2002JA009796
Physics
4
Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Electric Fields (2411)
Scientific paper
It is well known that auroral kilometric radiation (AKR) is intensified during substorms and has a good correlation with AE index. In the case of the magnetic storms, however, AKR characteristics have not been investigated. In this paper we report unexpected behavior of the storm-time AKR and its related particle precipitation: (1) AKR often disappears in the initial and main phases of the magnetic storms in spite of the large enhancement of AE index and field-aligned current; (2) At that time, the energy spectra of precipitating electrons do not show signature of the field-aligned acceleration but hot electron injection; (3) The radiation activates strongly in the recovery phase; and (4) AKR tends to disappear in larger storms. These results suggest that the field-aligned electric field which accelerates precipitating electrons and drives field-aligned currents is not formed in the initial and main phases of magnetic storms.
Hashimoto Katsumi
Matsumoto Haru
Misawa Hiroaki
Miyoshi Yasunobu
Morioka Akira
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