Poor CME Productivity in Active Region 10960

Details Poor CME Productivity in Active Region 10960 Poor CME Productivity in Active Region 10960

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh31a..03y&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH31A-03

Physics

7513 Coronal Mass Ejections (2101), 7519 Flares

Scientific paper

Larger flares are generally likely to be associated with coronal mass ejections (CMEs), but there are some CME- poor active regions, which produce many large flares without associated CMEs. We present once such active region NOAA 10960, which produced 10 M-class flares during the disk passage. We examined their CME associations using coronagraph observations obtained by LASCO on SOHO and SECCHI on STEREO. The three coronagraph observations help us to determine whether or not a flare has the associated CME. We found that two out of 10 M-class flares were associated with the CMEs. The rate (20%) is low compared to the average CME association rate (50%) of M-class flares during the solar cycle 23. In addition, the associated CMEs are slow (337 km/s and 208 km/s); further strengthening the conclusion that AR 10960 is CME-poor. We consider various possibilities to explain why the active region is CME-poor.

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