Flare induced decay-less transverse oscillations in solar coronal loops

TL;DR

This study presents evidence of flare-induced, decay-less transverse oscillations in solar coronal loops, showing that flares increase oscillation amplitudes without altering their decay-less nature or periods, using advanced motion-magnification techniques.

Contribution

It demonstrates that flares can enhance oscillation amplitudes in coronal loops without affecting their decay-less behavior or periods, providing new insights into solar loop dynamics.

Findings

Flare increases oscillation amplitudes in coronal loops.

Oscillation periods remain unchanged before and after flares.

No phase difference observed among oscillating threads.

Abstract

Evidence of flare induced, large-amplitude, decay-less transverse oscillations is presented. A system of multi-thermal coronal loops as observed with the Atmospheric Imaging Assembly (AIA), exhibit decay-less transverse oscillations after a flare erupts nearby one of the loop footpoints. Measured oscillation periods lie between 4.2 min and 6.9 min wherein the displacement amplitudes range from 0.17 Mm to 1.16 Mm. A motion-magnification technique is employed to detect the pre-flare decay-less oscillations. These oscillations have similar periods (between 3.7 min and 5.0 min) like the previous ones but their amplitudes (0.04 Mm to 0.12 Mm) are found to be significantly smaller. No phase difference is found among oscillating threads of a loop when observed through a particular AIA channel or when their multi-channel signatures are compared. These features suggest that the occurrence of a flare in this case neither changed the nature of these oscillations (decaying vs decay-less) nor the oscillation periods. The only effect the flare has is to increase the oscillation amplitudes.