Ionospheric Geo-effectiveness of Magnetic Clouds

Details Ionospheric Geo-effectiveness of Magnetic Clouds Ionospheric Geo-effectiveness of Magnetic Clouds

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa72b0543b&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA72B-0543

Physics

2437 Ionospheric Dynamics, 2447 Modeling And Forecasting, 2475 Polar Cap Ionosphere, 2704 Auroral Phenomena (2407), 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

We present an analysis of the geo-effectiveness of magnetic clouds and the disturbed solar wind surrounding them. Estimates of the ionospheric Joule heating rates based on two ground magnetic indices and estimates of auroral zone particle heating from polar satellites will be combined to provide a summary of the total geomagnetic heating during magnetic cloud passage. Preliminary estimates suggest that intervals of magnetic cloud passage experience about 50 percent greater heating rates than intervals associated with the more general class of interplanetary coronal mass ejection. Heating rates for magnetic clouds are about four times greater than heating rates estimated for intervals of background slow solar wind flow. Preliminary work also indicates that magnetic clouds lying in the ecliptic plane (leading or trailing fields oriented N-S or S-N) have heating rates about 50 percent greater than clouds with leading or trailing fields perpendicular to the ecliptic plane. We will provide hourly heating profiles for more than 50 magnetic clouds passing the earth during the rise and peak of solar cycle 23.

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