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The Forbush decrease of November 17, 1966The Forbush decrease of November 17, 1966, takes place in two steps, a predecrease is followed by the main decrease. SSCs are observed on both occasions. The decrease is modest, short-lived, and is preceded and followed by an exceptionally steady level of the cosmic ray intensity. Preliminary results from a phenomenological study are presented. The observed changes in the cosmic ray intensity are correlated with interplanetary magnetic field direction at the onset of the predecrease and during part of the recovery phase. A simple explanation is given for the fact that the predecrease is not observed at the stations in the European-zone. It appears that a preferential recovery takes place from some directions in space, during the recovery phase of the Forbush decrease. Off-ecliptic scattering of lower energy cosmic rays is probably responsible for this. The same phenomena is probably also responsible for the difference between the amplitudes of the predecrease observed at different stations.
Document ID
19760044021
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Ahluwalia, H. S.
(New Mexico, University Albuquerque, N. Mex., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Subject Category
Space Radiation
Meeting Information
Meeting: International Cosmic Ray Conference
Location: Munich
Start Date: August 15, 1975
End Date: August 29, 1975
Accession Number
76A26987
Funding Number(s)
CONTRACT_GRANT: NGR-32-004-086
Distribution Limits
Public
Copyright
Other

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