Coronal Mass Ejections and Forbush Decreases |
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Authors: | Cane Hilary V |
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Institution: | (1) School of Mathematics and Physics, University of Tasmania, Tasmania, Australia |
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Abstract: | Coronal Mass Ejections (CMEs) are plasma eruptions from the solar atmosphere involving previously closed field regions which
are expelled into the interplanetary medium. Such regions, and the shocks which they may generate, have pronounced effects
on cosmic ray densities both locally and at some distance away. These energetic particle effects can often be used to identify
CMEs in the interplanetary medium, where they are usually called `ejecta'. When both the ejecta and shock effects are present
the resulting cosmic ray event is called a `classical, two-step' Forbush decrease. This paper will summarize the characteristics
of CMEs, their effects on particles and the present understanding of the mechanisms involved which cause the particle effects.
The role of CMEs in long term modulation will also be discussed.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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