Effect of East-West and Radial Anisotropy on Hale Cycle in the Harmonics of Daily Variation in C R Intensity

Details Effect of East-West and Radial Anisotropy on Hale Cycle in the Harmonics of Daily Variation in C R Intensity Effect of East-West and Radial Anisotropy on Hale Cycle in the Harmonics of Daily Variation in C R Intensity

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.4005a&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

The data of the Deep River neutron monitoring station has been harmonically analysed for the period 1964-95 to obtain the diurnal and semi-diurnal components of cosmic ray intensity on geomagnetically 60 quiet days. The annual diurnal anisotropy vectors have been resolved into two components, one along the 12-Hr direction, the radial anisotropy component and the other along 18-Hr direction, east-west anisotropy component. It is observed that when the polarity of SPMF in NH is positive, the radial anisotropy component increases; whereas, east-west anisotropy component decreases. This results in shifting the diurnal anisotropy vector towards earlier hours during positive polarity epoch. During negative polarity epoch, the east-west anisotropy component attains its maximum and the radial anisotropy component attains its minimum, which results in shifting the anisotropy vector gradually towards later hours. For semi-diurnal anisotropy it is found that the magnitude of 3-Hr component is larger as compared to 6-Hr component during the positive polarity epoch, which results in shifting the anisotropy vector towards earlier hours but the same does not hold good for the negative polarity epoch i.e, the magnitude of 6-Hr component is not always found to be greater as compared to the 3-Hr component.

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