Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611569c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,569-11,585.
Physics
25
Cosmic Rays, Interplanetary Magnetic Fields, Solar Activity Effects, Asymmetry, Galactic Cosmic Rays, Magnetic Rigidity, Modulation
Scientific paper
A comprehensive new analysis is reported of IMF sector-dependent anisotropies observed by neutron monitors during more than three decades, and the implications of the observations for the question of north-south asymmetric solar modulation of cosmic rays are considered. The magnitude of the latitude gradient deduced from the observations is typically of the order 0.7 pct/AU, and its direction varies in a manner not obviously related to either the 11-yr sunspot cycle or the 22-yr solar magnetic cycle. Further support for the reality of a unidirectional gradient is provided by an analysis of the cosmic ray density segregated according to sector polarity. The density is found to differ significantly in the two sector types, and the amount of difference is correlated with the concurrently measured unidirectional latitude gradient in the expected manner. Hypotheses accounting for a north-south asymmetry of solar modulation are examined.
Bieber John W.
Chen Jiasheng
Pomerantz Martin A.
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