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Forbush decrease

(decrease in cosmic rays after a coronal mass ejection)

The Forbush decrease is a reduction in received extreme energy cosmic rays for a period of time subsequent to a coronal mass ejection (CME). The decrease begins after the CME, decreases over a few hours, remains low for a few days, and returns to normal. It is attributed to the magnetic field of the solar wind associated with the CME.


(cosmic rays)
Further reading:
http://en.wikipedia.org/wiki/Forbush_decrease
https://astronomy.swin.edu.au/cosmos/F/Forbush+Decrease

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