Physics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993stin...9427607a&link_type=abstract
Unknown
Physics
Cosmic Ray Showers, Interplanetary Magnetic Fields, Magnetic Effects, Shadows, Solar Magnetic Field, Solar Terrestrial Interactions, Sun, Geomagnetism, Moon, Solar Activity, Solar Activity Effects
Scientific paper
The Tibet air shower array, which has been successively operated at an altitude of 4,300 m a.s.l. since 1990, has detected the shadows of the sun and moon in the 10 TeV cosmic ray flux. In particular, the shadow of the sun was observed in the direction significantly away from the apparent solar position, under the influence of the solar and interplanetary magnetic fields. A further analysis shows that the shadows by cosmic rays are shifted in opposite directions according to the polarity of the fields. This is the first direct observation of the influence of the interplanetary magnetic field on the shadow's displacement. The results imply that observation of the cosmic ray shadow by the sun can produce new information on the relation between a time variation of the large-scale structure of the solar and interplanetary magnetic fields and the cycle of solar activity.
Amenomori Michihiro
Cao Zhoujian
Ding Lin-Kai
Feng Zhao-Yang
Hibino Kinya
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