Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3523f&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
The narrow angle muon telescope at Mt. Norikura has been operated since May 1998. The telescope covers 50 degrees of the sky with angular resolution of about 7 degrees. Forbush decrease larger than about 4 percent were observed of five events. The differences of the counting rate from a level before Forbush decrease are plotted in the two-dimentional map of 21 times 21 bin. The time sequence of the plot indicates that the decrement of viewing directions of the telescopes are not uniform and the decrement start from a directional side in sharp decreasing phase of all events. This may due to the geometrical relation with the viewing directions of the telescopes to the front of the cloud , when the magnetic cloud that go to the direction decided by the position of the solar flare arrive at the Earth 1 Forbush decrease We observed Forbush decrease of cosmic rays larger than about 4 percent of five events. as shown in Figure 1. Figure 1a 1998 August event The variation of the vertical telescope is shown in unit of percent. The time is local time in Japan.
Aoki Tadao
Fujimoto Kazuya
Kojima Hedeyasu
Mitsui Kenji
Ohashi Yoji
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