Longterm variations of ICMEs and their geoeffectiveness

Details Longterm variations of ICMEs and their geoeffectiveness Longterm variations of ICMEs and their geoeffectiveness

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh21a0497l&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH21A-0497

Physics

2100 Interplanetary Physics, 2111 Ejecta, Driver Gases, And Magnetic Clouds, 2134 Interplanetary Magnetic Fields, 2162 Solar Cycle Variations (7536), 2788 Storms And Substorms

Scientific paper

Solar wind and IMF in situ observations from instruments on board WIND and ACE spacecraft cover over half a solar cycle, the rising phase of cycle 23. Using these data set, we identify magntic clouds, non-cloud ejecta and some complex transient signatures. The relative frequency of the occurrences of these transients vary when the solar cycle proceeds. Majority of the magnetic clouds and non-cloud ejecta (together we call them ICMEs) have bipolar magnetic signatures in the Bz component. The polarity of the Bz component show also a trend to vary with the solar cycle, in particular a correlation with the solar polar magnetic field reversals, but with an interesting phase delay. The geoeffectiveness of these transients are also studied using Kyoto Dst index.

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