CME shock warps coronal streamer - observation and MHD simulation

Details CME shock warps coronal streamer - observation and MHD simulation CME shock warps coronal streamer - observation and MHD simulation

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506...71v&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

9

Coronal Mass Ejection, Shock Interaction, Numerical Simulation

Scientific paper

A fast (v ≥ 1000 km s-1) CME was observed on 14 January 2002, which was linked to an M4.4 long-duration flare event and a post-eruption loop system visible on, but partially occulted by, the SW limb. The fast expanding CME collided with a North-hemispheric helmet streamer, which was located above NOAA AR 9773 and was in 60° distance from the CME source region. An interaction with the CME (I) pushed the streamer aside and (II) created a deflection, setting off an outward propagating wavelike deformation along it. At the same time, a decametric-hectometric type-II radio burst was observed with the WAVES RAD2 instrument onboard the WIND spacecraft. Type-II bursts are indicative of shock waves. At about the time of the CME-streamer interaction a splitting was seen in the type-II emission, which indicated a shock continuing to propagate away from the Sun (thus getting into lower and lower density domains) and another branch, which indicated a shock propagating into denser plasma domain. We interpret this fine-structure of the type-II bursts as a result of the CME-streamer interaction. We suggest that the shock wave, which was associated with this fast CME, penetrated into the helmet streamer and then died away in the denser plasma (the splitting lasted for about 30 minutes). With our 2-D MHD code we simulate this CME-streamer interaction, using the observed configuration and magnetic topology. The simulation results confirm our hypothesis.

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