Transient Magnetic and Doppler Features Related to the White-light Flares in NOAA 10486

TL;DR

This study investigates rapidly moving transient magnetic and Doppler features during two major solar flares, revealing their association with energetic white-light events and their relation to flare emissions across multiple solar layers.

Contribution

The paper identifies and analyzes transient magnetic and Doppler features during solar flares, linking their movement and origin to flare energetics and multi-layer emissions, which is a novel detailed examination.

Findings

Transient features moved at 30-50 km/s during flares.

Features were located near known acoustic and seismic sources.

Transient features correlated with flare emissions across different solar layers.

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 \cite{Donea05} and seismic sources \cite{Zharkova07}. We examine the origin of these features and their relationship with various aspects of the flares, {\it viz.}, hard X-ray emission sources and flare kernels observed at different layers - (i) photosphere (white-light continuum), (ii) chromosphere (H$\alpha$ 6563\AA), (iii) temperature minimum region (UV 1600\AA), and (iv) transition region (UV 284\AA).