Physics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9425l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9425-9438.
Physics
27
Interplanetary Magnetic Fields, Magnetic Clouds, Solar Atmosphere, Solar Cosmic Rays, Explorer 50 Satellite, International Sun Earth Explorer 3, Magnetosheath, Shock Wave Interaction, Solar Wind
Scientific paper
The observation of one of the largest magnetic clouds ever observed at a distance of 1 AU, with a diameter of greater than about 0.4 AU, is reported. The cloud is shown to be almost unchanged structurally by interaction with the earth bow shock. The first observations are reported of an auroral activity response to the passage of a magnetic cloud, with a nearly immediate increase in auroral activity when the IMF theta(B) angle reversed polarity to negative near the cloud center. The results provide strong evidence that turbulent magnetic fields behind interplanetary shocks are a possible cause of Forbush decreases, but contest the idea that relatively smooth, strong fields in clouds are a cause of such decreases. The cloud field modeling supports the existence of magnetic force-free fields in describing cloud structure.
Burlaga Leonard Francis
Lazarus Andrew J.
Lepping Ronald P.
Ogilvie Keith. W.
Tsurutani Bruce T.
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