Physics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33.1069s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 33, Sept. 1985, p. 1069-1072.
Physics
10
Anisotropy, Diurnal Variations, Muons, Sidereal Time, Cosmic Rays, Eigenvalues, Solar Magnetic Field, Underground Storage
Scientific paper
Data from underground muon telescopes in New Mexico and Bolivia are analyzed in sidereal time and antisidereal time to study anisotropies in the rigidity range 20 GV to a few 100s of GV. Using both vertical and north- and south-pointing telescopes in both hemispheres, a latitude range of 70 deg N-50 deg S is covered. The distribution of cosmic rays in the inner heliosphere gives rise to a diurnal variation in antisidereal time, and also produces a spurious contribution to the anisotropy in sidereal time. It is shown that the antisidereal variation is of the P2 super 1 type, having opposite phase in the Northern and Southern Hemispheres, and maximum amplitude at mid latitudes. The antisidereal data are used to correct the sidereal data, using the Nagashima (1985) method; the resulting corrected sidereal vectors for Northern Hemisphere telescopes have their sidereal maxima close to 3 h sidereal time, in reasonable agreement with sidereal data at higher energies from small air showers. The Nagashima correction also appears to eliminate effects due to the reversal of the sun's polar magnetic field, which show up in the uncorrected sidereal data, and which also remain in corrected data using an alternative correction.
Nagashima Kana
Swinson Derek B.
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