Relation between Coronal Mass Ejection, Type II Radio Burst, and EUV Wave during the 2008 March 25 STEREO Event

Details Relation between Coronal Mass Ejection, Type II Radio Burst, and EUV Wave during the 2008 March 25 STEREO Event Relation between Coronal Mass Ejection, Type II Radio Burst, and EUV Wave during the 2008 March 25 STEREO Event

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh12a..02g&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH12A-02

Physics

7519 Flares, 7531 Prominence Eruptions, 7534 Radio Emissions

Scientific paper

STEREO and SOHO observations of the March 25, 2008 coronal mass ejection (CME) provide an excellent opportunity to study its early evolution from multiple view points. The CME was fast (980 km/s) and wide (112 degrees) from the east limb of the Sun as viewed by SOHO. The STEREO spacecraft were separated by about 50 degrees, so the CME was a disk event for the STEREO-behind spacecraft and a behind-the-limb event for STEREO-ahead. The CME was associated with a well defined EUV wave as observed by the STEREO/EUVI instrument, a metric type II burst, and a multi-component type II burst observed by the STEREO/WAVES and Wind/WAVES instruments. One of the important aspect of this CME is that it was well observed by STEREO/SECCHI inner coronagraph (COR1) when the metric type II burst was in progress, so we are able to obtain the shock height with respect t the CME. This enabled us to infer the connection the coronal shock driven by the CME (inferred from type II burst) and the EUV wave. It appears that the EUV wave steepened into a shock and produced the type II burst. The multiple components of the type II burst were not harmonically related, so we examined the circumstances of the eruption. CME was ejected in the region between two streamers, so the CME-driven shock is likely to simultaneously encounter high and low- density regions of the corona, thus producing type II bursts at widely separated frequencies. This paper summarizes these observations and explains how the CME, type II radio burst, and EUV waves all fit together.

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