Mass and Speed of the April 21, 2002 CME at 1.64 Solar Radii

Details Mass and Speed of the April 21, 2002 CME at 1.64 Solar Radii Mass and Speed of the April 21, 2002 CME at 1.64 Solar Radii

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm31b1105r&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM31B-1105

Physics

7513 Coronal Mass Ejections, 7549 Ultraviolet Emissions

Scientific paper

A partial halo CME was associated with an X-class flare on April 21, 2002. It accelerated to 2500 km/s and produced an SEP event. UVCS/SOHO observed the event at 1.64 solar radii, near the peak acceleration. The UV spectra establish the conditions in the pre-CME streamer where much of the mass of the CME originates. Doppler shifts show that a large part of the streamer motion is transverse rather than radial, with an Earth-directed velocity component of 850 km/s. The transverse acceleration is even larger than the radial acceleration. From the density and acceleration we derive a lower limit to the magnetic field at 1.64 solar radii. High temperature emission indicates a probable current sheet, which in some CME models is vital to the CME acceleration. Thus we obtain estimates of the mass, acceleration and magnetic field of the CME in the region of the corona where these quantities are established.

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