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|Title:||Cosmic ray Forbush decreases after the giant solar flare of 15 February 2011|
|Authors:||Kane, R P|
Coronal mass ejection (CME)
|Abstract:||<span style="mso-ansi-language: EN" lang="EN">A very strong X-ray solar flare occurred at about 0200 hrs UT on 15 February 2011. It was associated with a coronal mass ejection (CME) but the CME was not very strong and its interplanetary CME (ICME) took about 70 h to reach the Earth. Also, the ICME blob had a moderate, short-lived magnetic field <i style="mso-bidi-font-style:normal">B,</i> so the resulting cosmic ray Forbush decrease (FD) was weak. The <i style="mso-bidi-font-style:normal">Bz</i> component was only slightly negative, so the resulting geomagnetic storm magnitude <i style="mso-bidi-font-style:normal">Dst</i> was negligibly small. Thus, this giant solar flare had very poor geo-effectiveness indicating that large flares need not necessarily lead to significant storm effects on Earth, particularly in the early part of a sunspot cycle when overall solar activity would be weak. </span>|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.41(5) [October 2012]|
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