Observation of Anisotropy of Cosmic Rays with Solar Time Using the Multidirectional Muon Telescope of GRAPES-3 Shower Array

Details Observation of Anisotropy of Cosmic Rays with Solar Time Using the Multidirectional Muon Telescope of GRAPES-3 Shower Array Observation of Anisotropy of Cosmic Rays with Solar Time Using the Multidirectional Muon Telescope of GRAPES-3 Shower Array

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.3913k&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

We have used the East-West method in which the observational data of the West-ward direction is subtracted from the East-ward direction. With this method, we are able to eliminate the common components varying with time. We have been able to obtain accurate sidereal time variation of cosmic rays from the last 3 years of observations and those results are being presented elsewhere in this conference. Now we are confident that we can reduce the noise level significantly with this analysis. Using the data taken during 2000-2001 we have found anisotropy in Solar time variation of cosmic rays. This anisotropy shows maxima in the direction of 15∧ h Solar time with the North oriented telescope and 9∧ h Solar time with the South oriented telescope. These peaks can also be seen in both year's data separately. These features may be related with the density gradient of cosmic rays in the Solar system. We are attempting to get detailed understanding for these observations while accumulating more data. Further studies under different experimental conditions are considered desirable. Details of observations and results would be discussed at the conference.

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