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Solar cycle variations in IMF intensityAnnual averages of logarithms of hourly interplanetary magnetic field (IMF) intensities, obtained from geocentric spacecraft between November 1963 and December 1977, reveal the following solar cycle variation. For 2-3 years at each solar minimum period, the IMF intensity is depressed by 10-15% relative to its mean value realized during a broad 9-year period centered at solar maximum. No systematic variations occur during this 9-year period. The solar minimum decrease, although small in relation to variations in some other solar wind parameters, is both statistically and physically significant.
Document ID
19800026375
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
King, J. H.
(NASA Goddard Space Flight Center Laboratory for Extraterrestrial Physics, Greenbelt, Md., United States)
Date Acquired
August 10, 2013
Publication Date
October 1, 1979
Publication Information
Publication: Journal of Geophysical Research
Volume: 84
Subject Category
Solar Physics
Accession Number
80A10545
Distribution Limits
Public
Copyright
Other

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