CME Productivity of Active Regions 11158 and 11166

Details CME Productivity of Active Regions 11158 and 11166 CME Productivity of Active Regions 11158 and 11166

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh13b1965y&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH13B-1965

Astronomy and Astrophysics

Astrophysics

[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7519] Solar Physics, Astrophysics, And Astronomy / Flares

Scientific paper

Active regions (ARs) 11158 and 11166 respectively produced an X-class flare on 2011 Feb 15 and March 9. The former flare was associated with a CME, but the latter one was not. We examined the CME productivity of the two active regions. AR 11158 emerged at around 3 UT on 2011 Feb 10. The first major flare from the active region was the M6.6 flare at 17:28 on Feb 13 which was associated with a CME. The CME productivity was very high on Feb 14 and 15. Out of 11 flares (>C3 level), 10 had an associated CMEs. The CME productivity suddenly dropped on Feb 18. There were 2 M- and 4 C-class flares but none of them had an associated CME. AR 11166 emerged on Feb 25 on the far side of the Sun and appeared on the east limb on March 2. One X-, four M-, and 16 upper C-class (C3-C9) flares occurred during the disk passage. The CME productivity of the AR was not low since 11 out of 20 M- and C-class flares had an associated CME. The X1.5 flare lacking an associated CME is very special in terms of the CME productivity of the AR 11166. We discuss the reason why the X flare lacked a CME.

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