Galactic cosmic-ray anisotropy and its heliospheric modulation, inferred from the sidereal semidiurnal variations observed in the rigidity range 300-600 GV with multidirectional muon telescope at Sakashita Underground Station

Details Galactic cosmic-ray anisotropy and its heliospheric modulation, inferred from the sidereal semidiurnal variations observed in the rigidity range 300-600 GV with multidirectional muon telescope at Sakashita Underground Station Galactic cosmic-ray anisotropy and its heliospheric modulation, inferred from the sidereal semidiurnal variations observed in the rigidity range 300-600 GV with multidirectional muon telescope at Sakashita Underground Station

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39.1637n&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, Dec. 1991, p. 1637-1655.

Computer Science

3

Galactic Cosmic Rays, Heliosphere, Muons, Radiant Flux Density, Anisotropy, Diurnal Variations, Sidereal Time, Telescopes

Scientific paper

The directions and magnitudes of the first- and second-order anisotropies are determined in a specific galactic cosmic-ray intensity distribution with data from 10 telescopes. The investigation is conducted with specific attention given to the geometric configuration of the telescopes, the influence of the cosmic rays' heliomagnetospheric modulation, the geomagnetic deflection, and the nuclear interaction with the earth. The first-order anisotropy is included since it can produce a semidiurnal variation due to heliospheric modulation. The magnitudes of the first- and second-order modulations are more than and less than zero, respectively, and have approximately the same direction. The anisotropy is expressed as an axis-symmetric loss-cone type and is compared to a similar expression for a previously observed anisotropy.

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