Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.3927f&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
1
Scientific paper
One of Authors reported that the cosmic ray sidereal daily variation in the energy region less than 10TeV was due to two kinds of anisotropy. One is the galactic anisotropy from the direction of the right ascension 0 hour. The other is discovered directional excess flux (called tail-in anisotropy) fromthe direction 6 hour and observed only in the energy less than 10TeV. It is suggested that the excess flux is solar origin and the direction toward it seems to coincide with the expected heliotail-in direction. In this paper, it is shown as one more evidence of the directional flux is larger at the winter solstics when the Earth is close to the magnetotail and smaller at the remote sideofthe tail-in anisotropy. .çççç Introduction It was suggested by Compton and Getting (1935) that a cosmic ray anisotropy may be produced on the Earth by the motion of the solar system relative to the cosmic ray gas. Many observations of cosmic ray sidereal variation have been made with this suggestion. In the low-energy region less than 10TeV, howevere, any model ofanisotropyhas difficulty in explaining the observed variations. Such a difficulty was resoluved through the discovery of two kinds of anisotropy (Nagashima et al.1998,hereafter, called Ref.1). Co-existence of the galactic and tail-in anisotropies have been also confirmed by D.L.Hall et al (1999). In this paper, one more evidence ofthe existence oftail-in anisotropyis shown. .çççç Sidereal daily variation The cosmic ray data used for the present analysis are those of the muon telescopes at the underground stations Sakashita (latitude 36N,longitude 138E,depth80mwe),Matsushiro (latitude 37N, longitude 138E,depth 236mwe) and Hobart(latitude43S,
Duldig Marc L.
Fujii Zenjiro
Fujimoto Kazuya
Humble John E.
Kato Chihiro
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