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Observations of the dynamics of the cosmic ray modulation (1984)

Webber, W. R. ; Lockwood, J. A.

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Publication Date: 2019-06-28

Description: New measurements of the outward propagation of the cosmic ray modulation and large transient decreases at a radial distance of 10-30 AU from the earth are reported. Also, new observations of the hysteresis effect in the 11-year modulation are presented for two solar cycles, and an attempt is made to reproduce the long-term modulation at earth from the observed transient or Forbush decreases. The results indicate that steady-state, spherically symmetric models of the heliosphere are not capable of explaining the 11-year variation. A time-dependent solution to the cosmic ray transport equation is required to describe the solar cosmic ray modulation.

Keywords: SPACE RADIATION

Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 17-25

Format: text

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