Types of interplanetary shocks and forbush decreases

descriptionPublicationkeyboard_double_arrow_right Article 01 Aug 1991 English Publisher:Springer Science and Business Media LLCJournal:Solar Physics, volume 134, pages 395-401 (issn: 0038-0938, eissn: 1573-093X,

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Authors: null Badruddin; D. Venkatesan; A. G. Ananth;

doi: 10.1007/bf00152655

Types of interplanetary shocks and forbush decreases

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Abstract

Two types of interplanetary shocks have been identified and classified into two groups, those associated with a helium-enhancement and those not associated with any helium-enhancement. The cosmic-ray intensity decreases at Calgary neutron monitor are studied with respect to the arrival time of the two groups of shocks. The observations show that large Forbush decreases are caused by shocks associated with the helium-enhancement; and those not associated with He shocks show comparatively a small decrease in cosmic-ray intensity.

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University of Calgary
Canada

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