Physics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ncimc..12..695n&link_type=abstract
Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 12 C, Nov.-Dec. 1989, p. 695-749.
Physics
49
Anisotropic Media, Cosmic Ray Showers, Galactic Cosmic Rays, Solar Magnetic Field, Stellar Magnetospheres, Sidereal Time, Telescopes
Scientific paper
A cosmic-ray sidereal daily variation of galactic origin has been studied through observations of extensive air showers (EAS) conducted since 1970 at Mt. Norikura. The EASs exhibit a significant sidereal diurnal variation; sidereal semidiurnal and tridiurnal variations are also statistically significant. These phenomena are subject to the annual variation due to the heliomagnetospheric modulation of the galactic anisotropy, which in turn changes its phase in keeping with the polarity reversal of the sun's polar magnetic field. This indicates a charged cosmic-ray origin for the anisotropy.
Fujii Zenjiro
Fujimoto Kazuya
Nagashima Kana
Sakakibara Seiichiro
Ueno Hideki
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