Geoeffectiveness of High-Speed Streams, Coronal Mass Ejections, and Interplanetary Shocks

Details Geoeffectiveness of High-Speed Streams, Coronal Mass Ejections, and Interplanetary Shocks Geoeffectiveness of High-Speed Streams, Coronal Mass Ejections, and Interplanetary Shocks

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh33c..05l&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH33C-05

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Corotating high-speed solar wind streams, coronal mass ejections, and interplanetary shocks are common causes of geomagnetic storms in Earth's magnetosphere and ionosphere. Epoch analysis is performed for events associated with three types of interplanetary structures during the period of 1995-2003, including 17 events of high-speed streams (HSSs), 18 events of interplanetary shocks followed by complex ejecta, and 18 events of shocks followed by magnetic clouds. It is found that, on average, the HHS events resemble a weak geomagnetic storm with a minimum Dst value of -40 nT. The average behavior of the shock/ejecta and shock/cloud events possess the characteristics of a two-step main phase storm, showing the first dip in the sheath region and the second dip in the following cloud or ejecta. Amongst the 53 events studied there are 8 superstorms with the minimum Dst < -250 nT. Four of them are associated with the sheath region and 4 are associated with either clouds or ejecta, which makes the sheath region as "geoeffective" as magnetic clouds or ejecta in producing superstorms.

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