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Title: Cosmic ray Forbush decreases after the giant solar flare of 15 February 2011
Authors: Kane, R P
Keywords: Forbush decrease
Solar flare
Coronal mass ejection (CME)
Geomagnetic storm
Cosmic ray
Issue Date: Oct-2012
Publisher: NISCAIR-CSIR, India
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>
Description: 520-523
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.41(5) [October 2012]

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