Modulation of high-energy cosmic rays in the heliosphere

Details Modulation of high-energy cosmic rays in the heliosphere Modulation of high-energy cosmic rays in the heliosphere

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9921443h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A11, p. 21,443-21,455

Physics

6

Cosmic Rays, Diurnal Variations, Heliosphere, Interplanetary Magnetic Fields, Polarity, Sidereal Time, Solar Cycles, Solar Magnetic Field, Density Distribution, Galactic Radiation, Muons, Neutron Counters, Neutrons, Radial Distribution, Telescopes, Temporal Distribution

Scientific paper

We have used sidereal diurnal variations observed by neutron monitors and surface and underground muon telescopes to examine the north-south anisotropy and radical density gradient of high-energy galactic cosmic rays between 1957 and 1985. We have derived the average amplitude and rigidity spectrum of the anistropy for this period and estimate the radial gradient to be best represented as a function of rigidity P by 1.02 x (P/10)-0.5%/AU for rigidities less than approximately 450 GV. The temporal variation of both the north-south anisotropy and the radical density gradient show a solar cycle variation. Possible dependence of the anisotropy on the solar magnetic polarity state has been examined under the assumptions of a static and a nonstatic rigidity spectrum, with conflicting results. We show that the analysis is affected by a further sidereal variation and that the responsible anisotropy is related to the asymmetric heliospheric modulation of a galactic anisotropy.

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