Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.4091d&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 Amplitude and the Phase of the diurnal anisotropy of cosmic ray (CR) intensity; on 60 geo-magnetically quietest days (QD), have been investigated together with other solar features. The diurnal phase has remained statistically constant in co-rotational direction during 1987-1992, which is analogous to the constant phase during the period of 1965-1970. The phase shift towards earlier hours is pronounced in the years 1971, 1973 and1975; which reaches to its maximum during 1976. This could not be explained on the basis of lower values of cutoff rigidity; because the change is more pronounced for higher primary rigidity. The phase has recovered its usual co-rotational (18 Hr) direction during 1980. Further, it remained constant from 1980 onwards till 1992. Again, from 1993 and onwards it has shown a tendency of shifting towards earlier hours. The maximum shift to earlier hours has been reported during 1953-54; i.e. the period of minimum solar activity, is repeated during the period 1975-76 and once again as it approaches to the period of minimum solar activity of solar cycle-22.
Dubey S. K.
Kathal B. K.
Kumar Santosh
Richharia Mahendra Kumar
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