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Characteristics of enhanced and low-amplitude cosmic-ray diurnal variation

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Abstract

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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Author notes

  1. A. G. Ananth

    Present address: The Indian Space Research Organization, HQ, Antariksh Bhavan, Bangalore, India

  2. K. Kudela

    Present address: The Institute of Experimental Physics, SAS, Košice, Slovakia

Authors and Affiliations

  1. Institute for Space Physics, Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, Canada, T2N IN2

    A. G. Ananth, K. Kudela & D. Venkatesan

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  1. A. G. Ananth
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  2. K. Kudela
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  3. D. Venkatesan
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Ananth, A.G., Kudela, K. & Venkatesan, D. Characteristics of enhanced and low-amplitude cosmic-ray diurnal variation. Sol Phys 159, 191–202 (1995). https://doi.org/10.1007/BF00733042

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  • DOI: https://doi.org/10.1007/BF00733042

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