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

TL;DR

This study investigates how a large solar flare influences solar p-mode oscillations and subsurface flows, revealing significant changes in mode amplitude and flow patterns before and after the flare.

Contribution

It provides new insights into the impact of energetic flares on solar oscillation parameters and subsurface flow variations using ring diagram analysis.

Findings

Increase in mode amplitude post-flare

Systematic changes in subsurface flow components

Alterations in kinetic helicity and vorticity

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.