A multiwavelength study of an M-class flare and the origin of an associated eruption from NOAA AR 11045

Details A multiwavelength study of an M-class flare and the origin of an associated eruption from NOAA AR 11045 A multiwavelength study of an M-class flare and the origin of an associated eruption from NOAA AR 11045

Jul 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012newa...17..542d&link_type=abstract

New Astronomy, Volume 17, Issue 5, p. 542-551.

Astronomy and Astrophysics

Astronomy

Scientific paper

In this paper, we study multiwavelength observations of an M6.4 flare in Active Region NOAA 11045 on 7 February 2010. The space- and ground-based observations from STEREO, SoHO/MDI, EIT, and Nobeyama Radioheliograph were used for the study. This active region rapidly appeared at the north-eastern limb with an unusual emergence of a magnetic field. We find a unique observational signature of the magnetic field configuration at the flare site. Our observations show a change from dipolar to quadrapolar topology. This change in the magnetic field configuration results in its complexity and a build-up of the flare energy. We did not find any signature of magnetic flux cancellation during this process. We interpret the change in the magnetic field configuration as a consequence of the flux emergence and photospheric flows that have opposite vortices around the pair of opposite polarity spots. The negative-polarity spot rotating counterclockwise breaks the positive-polarity spot into two parts. The STEREO-A 195 Å and STEREO-B 171 Å coronal images during the flare reveal that a twisted flux tube expands and erupts resulting in a coronal mass ejection (CME). The formation of co-spatial bipolar radio contours at the same location also reveals the ongoing reconnection process above the flare site and thus the acceleration of non-thermal particles. The reconnection may also be responsible for the detachment of a ring-shaped twisted flux tube that further causes a CME eruption with a maximum speed of 446 km/s in the outer corona.

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