Access Restriction

Author Liu, Y. ♦ Luhmann, J. G. ♦ Bale, S. D. ♦ Lin, R. P.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Type Ii Burst ♦ Metric Type Ii Burst ♦ Cme-driven Shock ♦ Remote Deflec-tion ♦ Metric Type Ii Event ♦ Coronal Mass Ejection ♦ Time Curve ♦ Causal Relationship ♦ Coronal Metric Type Ii Burst ♦ Cme Speed ♦ Intense Matter ♦ Stereo Secchi ♦ Coronal Structure ♦ Decametric Hectometric Type Ii Burst ♦ Flare Blast Wave ♦ Unambiguous Evidence ♦ Streamer Deflection ♦ Shock Propagation ♦ Good Timing ♦ Type Ii ♦ Unprecedented High-cadence Observation ♦ Band Splitting
Abstract 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 deflec-tion 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.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Publisher Date 2009-01-01