Relationship Between a Coronal Mass Ejection-Driven Shock and a Coronal Metric Type II Burst

Details Relationship Between a Coronal Mass Ejection-Driven Shock and a Coronal Metric Type II Burst Relationship Between a Coronal Mass Ejection-Driven Shock and a Coronal Metric Type II Burst

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...691l.151l&link_type=abstract

The Astrophysical Journal Letters, Volume 691, Issue 2, pp. L151-L155 (2009).

Astronomy and Astrophysics

Astronomy

25

Shock Waves, Sun: Coronal Mass Ejections: Cmes, Sun: Flares, Sun: Radio Radiation

Scientific paper

It has been an intense matter of debate whether coronal metric type II bursts are generated by coronal mass ejection (CME)-driven shocks or flare blast waves. Using unprecedented high-cadence observations from STEREO/SECCHI, we investigate the relationship between a metric type II event and a shock driven by the 2007 December 31 CME. The existence of the CME-driven shock is indicated by the remote deflection of coronal structures, which is in good timing with the metric type II burst. The CME speed is about 600 km s-1 when the metric type II burst occurs, much larger than the Alfvén speed of 419-489 km s-1 determined from band splitting of the type II burst. A causal relationship is well established between the metric and decametric-hectometric type II bursts. The shock height-time curve determined from the type II bands is also consistent with the shock propagation obtained from the streamer deflection. These results provide unambiguous evidence that the metric type II burst is caused by the CME-driven shock.

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