Abstract:
The evolution of an X2.7 solar flare, that occurred in a complex βγδ-type active region on 2003 November 3, is
discussed utilizing multi-wavelength data set. The Hα images taken from solar tower telescope at ARIES,
Nainital, India, reveal well-defined footpoint (FP) and looptop (LT) sources. As the flare evolves, LT source
moves upward and the separation between the two FP sources increases which is consistent with the
reconnection models of solar flares. The coalignment of Hα with hard X-ray (HXR) images obtained from RHESSI
shows spatial correlation between Hα and HXR footpoints, while the upward moving HXR LT source is always
located above Hα LT source. The EUV images of flaring region at 195 Å taken from SOHO/EIT reveal intense
emission from low-lying loops near the active region during the impulsive phase. On the other hand, two bright
loops are seen well outside the active region which undergo large scale reorganization during the flare. In radio
wavelengths, type III radio bursts are observed few minutes prior to start of HXR LT emission indicating the
pre-flare coronal activity. A type II radio burst followed the main phase of the event. The observations support
the “break-out” model of solar eruptions proposed by S.Antiochos and coworkers.
