Characteristics of Enhanced and Low-Amplitude Cosmic-Ray Diurnal Variation

Details Characteristics of Enhanced and Low-Amplitude Cosmic-Ray Diurnal Variation Characteristics of Enhanced and Low-Amplitude Cosmic-Ray Diurnal Variation

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995soph..159..191a&link_type=abstract

Solar Physics, Volume 159, Issue 1, pp.191-202

Physics

9

Scientific paper

The occurrence of a large number of high- and low-amplitude cosmic-ray diurnal wave trains during the two solar cycles (20 and 21) over the years 1965 1990 has been examined as a function of solar activity. The high-amplitude days with the time of maximum in the ˜ 18:00 hr corotation direction do not indicate any significant correlation with solar activity. But, the low-amplitude days are inversely correlated with solar activity and the time of maximum shifts to earlier hours (˜ 15:00 hr direction). The slope of the power-specrum density roughly characterized by power spectral index ‘n’ in the high-frequency range 3.5 x 10-5 Hz to 8.3 x 10-4 Hz (time scales of 20 min to 8 hr) is different for the two classes of events. A suggestion is made that the enhanced and low-amplitude cosmic-ray diurnal variations are produced by different types of interplanetary magnetic field distributions.

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