Transient Magnetic and Doppler Features Related to the White-light Flares in NOAA 10486
Abstract
Rapidly moving transient features have been detected in magnetic and Doppler images of super-active region NOAA 10486 during the X17/4B flare of 28 October 2003 and the X10/2B flare of 29 October 2003. Both these flares were extremely energetic white-light events. The transient features appeared during impulsive phases of the flares and moved with speeds ranging from 30 to 50 km s-1. These features were located near the previously reported compact acoustic Donea05 and seismic sources Zharkova07. We examine the origin of these features and their relationship with various aspects of the flares, viz., hard X-ray emission sources and flare kernels observed at different layers - (i) photosphere (white-light continuum), (ii) chromosphere (Hα 6563), (iii) temperature minimum region (UV 1600), and (iv) transition region (UV 284).