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Title: IMF and geomagnetic activity during the solar wind disappearance event
Authors: Vats, Hari Om
Keywords: Interplanetary magnetic field;Geomagnetic activity;Solar wind;Solar wind disappearance
Issue Date: Oct-2006
Publisher: CSIR
Abstract: There was a very peculiar situation reported during 11-12 May 1999, that the "solar wind disappeared". This was one of the long lasting, low velocity and low density solar wind events and was caused by the passage of a “void” around the earth and its environment. The interplanetary magnetic field (IMF), especially, the north-south component (Bz) remained quiet during the event. However, it showed a fast and intense fluctuation after the passage of this low solar wind region or “void”. The equatorial Dst and Ap variations indicate a mild geomagnetic storm after the passage of void. This mild geomagnetic storm is probably due to fluctuations in Bz whose value varies from –12 to 9 nT.
Page(s): 307-311
ISSN: 0367-8393
Appears in Collections:IJRSP Vol.35(5) [October 2006]

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