  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.

Solar and Stellar Astrophysics