The Coronal and Interplanetary Context of Geoeffective ICMEs

Details The Coronal and Interplanetary Context of Geoeffective ICMEs The Coronal and Interplanetary Context of Geoeffective ICMEs

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh12b0752l&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH12B-0752

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds

Scientific paper

Odstrcil and Pizzo (December 1999 JGR) recently simulated interplanetary CME (ICME) propagation in a structured solar wind as a high velocity pressure pulse introduced into a bipolar fast flow bisected by a band of slow solar wind. Their results demonstrate how ejecta from different sides of a planar tilted helmet streamer belt produce different 1 AU interplanetary signatures due to the ejecta/stream structure interaction. Using the combination of ACE archived plasma and field data, SOHO-MDI magnetograph and SOHO EIT 195A synoptic maps, and the Kyoto Dst magnetic storm index, we examine the interplanetary context of CME ejecta, and their inferred coronal context. At the Sun, we consider the prevailing coronal hole geometry and helmet streamer belt configuration together with the location of associated disk activity (e.g. filament disruption or flare). In the interplanetary medium, we consider geoeffective parameters including the solar wind velocity and dynamic pressure, and the southward component of the interplanetary magnetic field. These parameters have been shown to produce excellent approximations to Dst when used in the Burton et al. (1975) formula. The real coronal and solar wind structure is typically much more complicated than the Odstrcil and Pizzo model, but some basic characteristics can be found such as ICMEs riding the crest of a high speed stream, or nestled in the low speed wind preceding a high speed stream. The comparisons with the ACE observations illustrate how the combination of solar magnetic field and solar wind stream structure conspires to make more or less geoeffective ICMEs, and provide a basis for future more realistic event modeling.

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