AKR Disappearance During Magnetic Storms

Details AKR Disappearance During Magnetic Storms AKR Disappearance During Magnetic Storms

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm52b..10m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM52B-10

Physics

2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2788 Storms And Substorms

Scientific paper

It is well known that auroral kilometric radiation (AKR) is intensified during substorm and has a good correlation with AE index. In the case of the magnetic storm, however, the AKR characteristics have not been investigated. In this paper, we report the unexpected behavior of the storm time AKR and 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, (2) At that time, the energy spectra of precipitating electrons do not show the signature of the field- aligned acceleration but the hot electron injection, (3) The radiation is activated strongly in the recovery phase, and (4) AKR disappearance phenomena tend to occur in larger storms. It can be suggested from these results 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.

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