Geo-effective Shock Sheaths And Icmes: Properties And Relations With Solar Sources

Details Geo-effective Shock Sheaths And Icmes: Properties And Relations With Solar Sources Geo-effective Shock Sheaths And Icmes: Properties And Relations With Solar Sources

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.3007p&link_type=abstract

American Astronomical Society Meeting 210, #30.07; Bulletin of the American Astronomical Society, Vol. 39, p.325

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This study focuses on the 47 major geomagnetic storms (Dst <= -100 nT) during 1996 - 2005 driven by transient solar wind flows of single interplanetary coronal mass ejections (ICMEs) including their upstream shock sheath regions (SHs). Compared with the other 22 major storms driven by complex ejecta involving multiple ICMEs, the interplanetary (IP) and solar sources of these storms are mostly reliably identified and well characterized. We will present the statistical properties of the SHs and ICMEs, including the distributions of their duration, linear size, mean strength of magnetic field (and southward magnetic field), mean proton temperature and density. In particular, we calculate the estimated solar wind energy input into the magnetosphere using the ɛ formula for SHs and ICMEs separately, and study the relative importance of SHs and ICMEs in terms of their geo-effectiveness. We find that 6 events(13%) are shock-sheath-dominant events (defined as SH contributes more than 80% power of the storm), 15 events (32%) are ICME-dominant events, and the rest 26events(55%) are more balanced events. We further study the possible correlations between various solar wind properties mentioned above with those of solar source regions, including CME speed, source region longitude and latitude. There is an apparent correlation between CME speed and interplanetary shock sheath temperature.

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