000007694 001__ 7694
000007694 005__ 20260105145656.0
000007694 0247_ $$2DOI$$a10.3847/1538-4357/ad95fb
000007694 037__ $$aSCART-2026-0002
000007694 100__ $$aShrivastav, Arpit Kumar 
000007694 245__ $$aOn the Existence of Long-period Decayless Oscillations in Short Active Region Loops
000007694 260__ $$c2025
000007694 520__ $$aDecayless kink oscillations, characterized by their lack of decay in amplitude, have been detected in coronal loops of varying scales in active regions, quiet Sun and coronal holes. Short-period (< 50 s) decayless oscillations have been detected in short loops (< 50 Mm) within active regions. Nevertheless, long-period decayless oscillations in these loops remain relatively unexplored and crucial for understanding the wave modes and excitation mechanisms of decayless oscillations. We present the statistical analysis of decayless oscillations from two active regions observed by the Extreme Ultraviolet Imager (EUI) onboard Solar Orbiter. The average loop length and period of the detected oscillations are 19 Mm and 151 seconds, respectively. We find 82 long-period and 23 short-period oscillations in these loops. We do not obtain a significant correlation between loop length and period. We discuss the possibility of different wave modes in short loops, although standing waves can not be excluded from possible wave modes. Furthermore, a different branch exists for active region short loops in the loop length vs period relation, similar to decayless waves in short loops in quiet Sun and coronal holes. The magnetic fields derived from MHD seismology, based on standing kink modes, show lower values for multiple oscillations compared to previous estimates for long loops in active regions. Additionally, the comparison of period distributions in short loops across different coronal regions indicates that different excitation mechanisms may trigger short-period kink oscillations in active regions compared to the quiet Sun and coronal holes.
000007694 594__ $$aSTCE
000007694 6531_ $$aEUI
000007694 6531_ $$aSolar Orbiter
000007694 6531_ $$adecayless oscillations
000007694 700__ $$aPant, Vaibhav  
000007694 700__ $$aKumar, Rohan
000007694 700__ $$aBerghmans, David
000007694 700__ $$aVan Doorsselaere, Tom
000007694 700__ $$aBanerjee, Dipankar
000007694 700__ $$aPetrova, Elena
000007694 700__ $$aLim, Daye
000007694 773__ $$n1  id.6$$pApJ$$v979$$y2025
000007694 8560_ $$fdavid.berghmans@ksb-orb.be
000007694 85642 $$ahttps://iopscience.iop.org/article/10.3847/1538-4357/ad95fb
000007694 85642 $$ahttps://arxiv.org/abs/2411.15646
000007694 905__ $$apublished in
000007694 980__ $$aREFERD