The intensity recovery of Forbush-type decreases as a function of heliocentric distance and its relationship to the 11-year variation

Details The intensity recovery of Forbush-type decreases as a function of heliocentric distance and its relationship to the 11-year variation The intensity recovery of Forbush-type decreases as a function of heliocentric distance and its relationship to the 11-year variation

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....4..388l&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 4 p 388-391 (SEE N85-34729 23-92)

Physics

Cosmic Rays, Forbush Decreases, Heliosphere, Interplanetary Magnetic Fields, Shock Wave Propagation, Periodic Variations, Solar Magnetic Field, Solar Neutrinos, Time Dependence

Scientific paper

Recent data indicating that the solar modulation effects are propagated outward in the heliospheric cavity suggest that the 11-year cosmic ray modulation can best be described by a dynamic time dependent model. In this context an understanding of the recovery characteristics of large transient Forbush type decreases is important. This includes the typical recovery time at a fixed energy at 1 AU as well as at large heliocentric radial distances, the energy dependence of the recovery time at 1 Au, and the dependence of the time for the intensity to decrease to the minimum in the transient decreases as a function of distance. These transient decreases are characterized by their asymmetrical decrease and recovery times, generally 1 to 2 days and 3 to 10 days respectively at approx. 1 AU. Near earth these are referred to as Forbush decreases, associated witha shock or blast wave passage. At R equal to or greater than + or - 10 AU, these transient decreases may represent the combined effects of several shock waves that have merged together.

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