Long Term Behavior of Higher Harmonics of Cosmic Ray Intensity on Quiet Days

Details Long Term Behavior of Higher Harmonics of Cosmic Ray Intensity on Quiet Days Long Term Behavior of Higher Harmonics of Cosmic Ray Intensity on Quiet Days

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.3945r&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 cosmic ray intensity data recorded with Deep River Neutron Monitoring Station have been investigated on 60 Quiet Days (QD) in a year for studying the higher harmonics of daily variation during solar cycle 21 and 22. It has been observed that inspite of the abrupt change in the amplitude and the phase of the higher harmonics of daily variation in cosmic ray intensity, the amplitude of third harmonics is quite significant throughout the period of investigation with larger amplitude during the year 1980 and 1985 due to changing of threshold cutoff rigidity of the station. The tri-diurnal anisotropy of cosmic ray intensity shows clearly long-term variation, i.e. 11-year variation at mid latitude station.

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