Influence of high speed solar wind streams in the long-term modulation of cosmic rays.

Details Influence of high speed solar wind streams in the long-term modulation of cosmic rays. Influence of high speed solar wind streams in the long-term modulation of cosmic rays.

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997injpb..71..455p&link_type=abstract

Indian J. Phys., Part B, Vol. 71B, No. 4, p. 455 - 463

Physics

1

Cosmic Rays: Solar Modulation, Cosmic Rays: Solar Wind, Solar Wind: Streams

Scientific paper

High speed solar wind streams can be distinguished into two kinds originated from two different sources. The first kind is a long-lasting high speed solar wind streams emitted by coronal holes that exhibit an apparent tendency to recur at intervals of ≡27 days, the so called corotating streams. The second one, characterized by lower solar wind streams associated with strong active regions emitting solar flares, are called flare generated streams. These two types of streams produce significantly different effects on the cosmic ray intensity on short-term as well as on long-term basis. In this analysis, the authors try to explain the long-term variations of the cosmic ray intensity on the basis of short-terms transient variations for the interval 1979 to 1990. The daily mean of one low and middle-latitude set of neutron monitor data have been analysed to observe average behaviour of cosmic ray intensity on short-term basis for the period 1986 - 1990. It has been found that flare-generated streams are significantly responsible in producing 11-year cyclic variation in cosmic ray intensity.

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