Variations in $p$-Mode Parameters with Changing Onset-Time of a Large Flare

Abstract

It is expected that energetic solar flares releasing large amount of energy at the photosphere may be able to excite the acoustic ($p$-) modes of oscillations. We have determined the characteristic properties of mode parameters by applying the ring diagram technique to 3-D power spectra obtained for solar active region NOAA 10486 during the long duration energetic X17.2/4B flare of October 28, 2003. Strong evidence of substantial increase in mode amplitude and systematic variations in sub-surface flows, i.e., meridional and zonal components of velocity, kinetic helicity, vorticity, is found from comparison of the pre- to the post-flare phases.

14 pages, 4 figures

References in corpus (2)

• Ring diagram analysis of the characteristics of solar oscillation modes in active regions
• Lifetimes of High-Degree p Modes in the Quiet and Active Sun

Cited by in corpus (4)

• Magnetic and Velocity Field Topology in Active Regions of Descending Phase of the Solar Cycle 23
• Sub-Surface Meridional flow, Vorticity and the life time of Solar Active Regions
• Effects of flares on solar high-degree helioseismic acoustic mode amplitudes
• Activity Related Variations of High-Degree p-Mode Amplitude, Width and Energy in Solar Active Regions