Latitudinal cosmic ray gradients - Their relation to solar activity asymmetry

Details Latitudinal cosmic ray gradients - Their relation to solar activity asymmetry Latitudinal cosmic ray gradients - Their relation to solar activity asymmetry

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1757s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1757-1765.

Physics

20

Cosmic Rays, Interplanetary Magnetic Fields, Potential Gradients, Solar Activity Effects, Diurnal Variations, Heliosphere, Neutral Sheets, Particle Telescopes, Solar Flux Density

Scientific paper

Data obtained by underground cosmic ray telescopes in the Northern and Southern Hemispheres between 1965 and 1985 are analyzed as a function of the IMF sense to examine the long-term nature of the latitudinal cosmic ray gradient. The nature of this gradient is inferred from the product between the B value and the latitudinal cosmic ray gradient contribution to the solar diurnal cosmic ray anisotropy arising from the interaction between the latitudinal gradient and the IMF B. Results are presented showing that asymmetry in activity on the sun displaces the heliospheric neutral sheet either below or above the earth (on average), according to the direction of the solar activity asymmetry. This displacement, combined with a latitudinal cosmic ray density gradient that is symmetrical in relation to the neutral sheet, produces a latitudinal cosmic ray gradient that is asymmetrical when viewed from the earth. The cosmic ray data are consistent with a symmetric (in relation to the neutral sheet) latitudinal cosmic ray density gradient in which the density initially decreases with distance from the neutral sheet and then increases again with increasing distance from the sheet.

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