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Cosmic ray decreases and magnetic cloudsA study has been made of energetic particle data, obtained from IMP 8, in conjunction with solar wind field and plasma data at the times of reported magnetic clouds. It is shown that magnetic clouds can cause a depression of the cosmic ray flux but high fields are required. A depression of 3 percent in a neutron monitor requires a field of about 25 nT. Such high fields are found only in a subset of coronal ejecta. The principal cause for Forbush decreases associated with energetic shocks is probably turbulence in the postshock region, although some shocks will be followed by an ejecta with a high field. Each event is different. The lower-energy particles can help in identifying the dominant processes in individual events.
Document ID
19930046791
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Cane, H. V.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
March 1, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: A3
ISSN: 0148-0227
Subject Category
Astrophysics
Accession Number
93A30788
Distribution Limits
Public
Copyright
Other

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