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Detailed Reference Information
Mathews et al. 1978
Mathews, T., Agrawal, S.P. and Venkatesan, D. (1978). A comparison of ground level cosmic ray enhancement of November 22, 1977 and February 25, 1969. Geophysical Research Letters 5: doi: 10.1029/GL005i012p01063. issn: 0094-8276.

The anisotropic solar flare increases observed by neutron monitors on November 22, 1977 and February 25, 1969 are discussed. These events such as anisotropy, rise and decay times are not signficantly different from one event to the other. This implies that the interplanetary conditions for propagation of cosmic rays of a few GeV (109 eV) energy are comparable at the sunspot maximum and minimum of solar cycle 20. Therefore, the near-earth environment does not play a major role in the modulation of galactic cosmic ray intensity and the cause of its 11-year variation has to be sought in the regions off the ecliptic plane and/or farther out in the ecliptic plane.

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Geophysical Research Letters
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American Geophysical Union
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