Lim, D. ; Van Doorsselaere, T. ; Berghmans, D.

Talk presented at Advances in Understanding Alfven Waves in the Sun and theHeliosphere, Berlin on 2023-05-30

Abstract: Rapid decayless transverse oscillations in a solar active region in the Extreme Ultraviolet Imager onboard Solar Orbiter are presented. The location and observation time of rapid oscillations in coronal loops are obtained by applying the Automated Northumbria University Wave Tracking algorithm. We consider multiple slits perpendicular to the axis of the oscillated loops. For each slit, the transverse displacements over time are generated by tracing the center and boundary of the loop, respectively. We examine whether the analyzed oscillation results from the displacement of the loop center and boundary are similar. As a result, two oscillations are detected: one with a period of about 30 seconds and an amplitude of about 14km and the other with a period of 77 seconds and an amplitude of 23 km. The estimated length of each loop exhibiting two oscillations could have two possibilities: around 15 and 31 Mm for the longer period oscillation and around 14 and 46 Mm for the shorter period oscillation. These two oscillations remain in phase along the loop axis and do not exhibit any significant decaying. Our results, in addition to previous studies, show that decayless transverse oscillations with even shorter periods and small amplitudes in small-scale loops exist, reinforcing the suggestion that these small-scale decayless oscillations are ubiquitous.