Differences Between CME Associated and CH Associated RED Events During 2005 (P4)

Details Differences Between CME Associated and CH Associated RED Events During 2005 (P4) Differences Between CME Associated and CH Associated RED Events During 2005 (P4)

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..96a&link_type=abstract

2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe

Astronomy and Astrophysics

Astrophysics

Scientific paper

As Part of study of RED (Relativistic Electron Decrease) events at Geostationary orbit, we have classified them on the basis of their solar cause. We find that the solar causes associated with RED events (J.J.Lee et.al., 2006) are Interplanetary Shocks (IPS), Coronal Mass Ejection (CME), Coronal Hole (CH), Flares, Magnetic Clouds and Corotating Interaction Regions (CIR). For present, we have taken CME and CH associated RED events during 2005. We study Interplanetary parameters (i.e. solar wind Velocity (Vsw), solar wind Ion density (Nsw), solar wind dynamic pressure (Pdsw), total Interplanetary magnetic field B along with its north-south component, Bz), Radiation belt parameters at geostationary orbit (i.e. electron flux>2Mev, Hp component (i.e. the component of magnetic field parallel to the spin axis of the satellite) and dayside magnetopause distance (MP)) and the geomagnetic indices (i.e. Dst, Kp and CRNM count). The parameters which show significant differences between CME and CH events are Vsw, Psw, B, Bz, Dst and Kp, with Vsw and Dstc showing the largest differences. As typical examples, in the case of the CME of 22nd January, 2005, Vsw touches over 975 km/sec and Dst is Sudden Storm Commencement (SSC) type with minimum Dst being 110 nT. In the case of the CH of 5th April, Vsw is only 650 km/sec and Dst is of Gradual Commencement (GC) type with minimum Dst of -80 nT. In this paper we present differences observed in the above mentioned parameters for several RED events associated with CME and CH during 2005.

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