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Ion drift simulation of sudden appearance of sub-keV structured ions in the inner magnetosphere.

Authors :
Yamauchi, M.
Ebihara, Y.
Nilsson, H.
Dandouras, I.
Source :
Annales Geophysicae (ANGEO) (09927689); 2014, Vol. 32 Issue 2, p83-90, 8p
Publication Year :
2014

Abstract

Energy–latitude dispersed structured sub-keV ions in the inner magnetosphere often show significant development or intensification (by more than factor of 3) within 1–2 h near noon or afternoon where the azimuthal ion drift velocity at the sub-keV range is expected to be near zero. To examine whether such sudden appearances in the day-side can be explained by the drift motion of ions that are formed during substorm-related injections, we numerically simulated two such examples, one at noon and the other in the afternoon, based on the ion drift model. For both cases, the ion drift model with finite duration of proton source in the nightside can explain the observed large inbound–outbound differences in the sub-keV proton population without any new sources. Ion drift motion can thus cause rapid changes of complicated ion populations, at remote places from the source a long time after the substorm activities. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09927689
Volume :
32
Issue :
2
Database :
Complementary Index
Journal :
Annales Geophysicae (ANGEO) (09927689)
Publication Type :
Academic Journal
Accession number :
94989062
Full Text :
https://doi.org/10.5194/angeo-32-83-2014