Influence of curvature of an interplanetary magnetic field on intensity of galactic cosmic rays registered near the earth's orbit

Details Influence of curvature of an interplanetary magnetic field on intensity of galactic cosmic rays registered near the earth's orbit Influence of curvature of an interplanetary magnetic field on intensity of galactic cosmic rays registered near the earth's orbit

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5610k&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5610

Astronomy and Astrophysics

Astronomy

Scientific paper

Long-term changes of intensity of GCR in heliosphere were analyzed using the data on abundance of cosmogenic isotopes (10Be and 14C) in natural archives and data of neutron monitors. The data contains information about short-term, 11-year, 22-year, centennial and two-centennial cycles of solar activity. Mechanism of long-term modulation of GCR caused by change in curvature of interplanetary magnetic field, resulted from respective change of solar activity, is suggested. It is known that the velocity of solar wind in heliosphere is not constant but changes when solar activity changes. The negative correlation between solar activity and solar wind velocity takes place at least at heliolatitudes more than 30 degrees. It leads to change in a curvature of interplanetary magnetic field. The changes of the curvature of interplanetary magnetic field, in turn, influenced propagation of galactic cosmic ray (GCR) and their concentration in heliosphere. This change in GCR intensity is reflected in abundance of cosmogenic isotope in natural archives and in neutron monitor data. This research was done in the frame of an exchange between the Russian and Finnish Academies (project N16) and was supported by the program "Astronomy: nonstationary processes in astronomy" of RAS. It was also supported by grant INTAS-2001-0550.

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