On the solar source of transient cosmic ray intensity variations

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Abstract
Studies of the mechanisms that produce transient cosmic ray intensity variations have been in progress for many years. It has long been recognized that classical nonrecurrent Forbush decreases (FD's), characterized by an abrupt reduction in the flux (typically over several hours) followed by a slow recovery (often lasting several weeks), are generally the result of processes initiated by solar flares. Thus, for example, it has been demonstrated that anisotropic cosmic ray flow patterns during FD's reflect the configuration of the flare‐associated interplanetary shocks that produce them [Duggal and Pomerantz, 1976].Much confusion has resulted from the logically incorrect premise that every transient intensity modulation (TIM) is a Forbush decrease. Thus analyses based upon the subjective assignment of a large number of TIM's to their presumed initiating flares have yielded disparate conclusions [Iucci et al, 1977; Krivsky et al, 1977].

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