Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.4025z&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 24, p. 4025-4028
Physics
Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions
Scientific paper
The interplanetary solar wind depletion (SWD) event of 26 April 1999 and its magnetospheric consequences are examined. The SWD event is characterized by a solar wind density decrease from ~3.0 to 0.7 cm-3 leading to a solar wind ram pressure decrease from ~2.0 to 0.2 nPa. This SWD onset is followed by a depolarization of nightside magnetospheric fields. At approximately the same time, an auroral pseudo-breakup occurred in the near-midnight auroral zone. A model is presented to explain the pseudobreakup as energy release by the tail magnetic field reconfiguration. The release of magnetic tension energy is estimated to have been ~3.3×1019ergs, while the auroral energy was approximately 30 % of this value, ~1.0×1019ergs. This result may imply that the magnetic field collapse led to direct particle acceleration through parallel electric fields.
Gonzalez Walter D.
Tsurutani Bruce T.
Zhou Xiaoyan
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