Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236.1012o&link_type=abstract
Astrophysical Journal, Part 1, vol. 236, Mar. 15, 1980, p. 1012-1016.
Astronomy and Astrophysics
Astrophysics
2
Cosmic Rays, Interplanetary Medium, Solar Rotation, Solar Terrestrial Interactions, Anisotropy, Interplanetary Magnetic Fields, Power Spectra, Spectrum Analysis, Twenty-Seven Day Variation
Scientific paper
Temporal power spectral analysis of data from a network of neutron monitors is used to determine the three-dimensional anisotropy vector associated with quasi-periodic 27 day solar rotational recurrences in the flux of relativistic (∼10 GV) cosmic rays near Earth. From the diurnal anisotropy, we show that the recurrent flux in the ecliptic plane is perpendicular to the average interplanetary magnetic field direction. The observed north-south intensity difference indicates that there is a similar recurrent flux in the direction perpendicular to the ecliptic. The observations are accounted for by a simple theoretical model in which the observed fluxes are attributed to particle gradient drifts arising from a symmetric cosmic-ray gradient about the average interplanetary magnetic field direction of ∼7% per AU.
Duggal Shakti P.
Owens A. J.
Pomerantz Marin A.
Tolba M. F.
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