Cosmic ray sidereal diurnal variation of galactic origin observed by neutron monitors

Details Cosmic ray sidereal diurnal variation of galactic origin observed by neutron monitors Cosmic ray sidereal diurnal variation of galactic origin observed by neutron monitors

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31.1269n&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 31, Nov. 1983, p. 1269-1278.

Physics

9

Diurnal Variations, Galactic Cosmic Rays, Radiation Measurement, Sidereal Time, Anisotropy, Histograms, Neutron Counters

Scientific paper

The sidereal diurnal variation of cosmic rays have been analyzed using 620 station-years of neutron monitor data during the period 1958-1979. The sidereal variation averaged over the period for all the stations in the Northern Hemisphere is different from the corresponding variation in the Southern Hemisphere. The difference is statistically significant and can be identified with the spurious sidereal variation produced from the stationary anisotropy of solar origin, responsible for the solar semi-diurnal variation. The variation common to both hemispheres is also exceptionally significant from the statistical point of view and could be regarded as being due to a uni-directional galactic anisotropy. This variation has an amplitude of 0.0204 + or 0.0015 percent and a phase of 6.8 + or - 0.3 h and is clearly different from that (0.05 percent, 0-3 h) observed in the high rigidity region (500-10000 GV). The physical meaning of the variation is discussed from the standpoint of the heliomagnetospheric modulation of galactic anisotropy.

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