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 \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$\alpha$ 6563Å), (iii) temperature minimum region (UV 1600Å), and (iv) transition region (UV 284Å).

26 pages, 13 figures, 2 tables, accepted for publication in Solar Physics

References in corpus (4)

• On the origin of 3 seismic sources in the proton-rich flare of October 28, 2003
• Properties of Flares-Generated Seismic Waves on the Sun
• Footpoint Motion of the Continuum Emission in the 2002 September 30 White-Light Flare
• On the Relationship between the Continuum Enhancement and Hard X-ray Emission in a White-Light Flare

Cited by in corpus (10)

• Sun-as-a-star Observation of White-Light Flares
• On the injection of helicity by shearing motion of fluxes in relation to Flares and CMEs
• Velocity and Magnetic Transients Driven by the X2.2 White-Light Flare of 2011 February 15 in NOAA 11158
• Non-LTE Calculations of the Fe I 6173 Å Line in a Flaring Atmosphere
• Eruptive-Impulsive Homologous M-class Flares Associated with Double-Decker Flux Rope Configuration in Mini-Sigmoid of NOAA 12673
• A Technique for Automated Determination of Flare-ribbon Separation and Energy Release
• Chromospheric Velocities of a C-class Flare
• Continuum enhancements, line profiles and magnetic field evolution during consecutive flares
• Activity Related Variations of High-Degree p-Mode Amplitude, Width and Energy in Solar Active Regions
• 3D Velocity Flows in Flare Productive and Dormant Active Regions