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Richardson et al. 1999
Richardson, I.G., Cane, H.V. and Wibberenz, G. (1999). A 22-year dependence in the size of near-ecliptic corotating cosmic ray depressions during five solar minima. Journal of Geophysical Research 104: doi: 10.1029/1999JA900130. issn: 0148-0227.

Evidence is presented for a 22-year cycle in the amplitude of recurrent, near-Earth, near-Ecliptic, galactic cosmic ray modulations during the solar minimum periods in the mid-1950s to mid-1990s. These modulations are ~50% larger during A>0 epochs than during A0 epochs. A change in the latitudinal GCR gradient in successive epochs is unlikely to be the sole reason for the change in depression size since (1) the proportionality constant between the recurrent depressions and latitudinal gradient depends on A, and (2) the cosmic ray density is not organized by crossings of the heliospheric current sheet. ¿ 1999 American Geophysical Union

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Abstract

Keywords
Solar Physics, Astrophysics, and Astronomy, Space Plasma Physics, Nonlinear phenomena
Journal
Journal of Geophysical Research
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Publisher
American Geophysical Union
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