Observation of pronounced isotropic variations of cosmic ray intensity during August–September 1979

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DOIResolve DOI: http://doi.org/10.1029/JA086iA06p04836
AuthorSearch for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Geophysical Research: Space Physics
ISSN0148-0227
Volume86
IssueA6
Pages48364838; # of pages: 3
AbstractA study of the cosmic ray intensity data from high-latitude stations reveals an isotropic variation of ∼30-day periodicity and a peak-to-peak amplitude of 10% during the two months August–September 1979. Such an unusual modulation of cosmic ray intensity has not been observed before. It is clear that the variation is worldwide and in view of no significant north-south asymmetry, we have to visualize the modulation region responsible for the effect to be extremely large. The rigidity spectra of the variation is found to be similar to that of Forbush decreases. The results are discussed in terms of solar activity. No obvious physical mechanism is readily seen, to account for this intensity variation.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedYes
NRC number19661
NPARC number21274946
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Record identifier61a4563e-9d4d-4d99-86fb-5339ef2fb7db
Record created2015-05-04
Record modified2016-05-09
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