000007826 001__ 7826
000007826 005__ 20260803155622.0
000007826 037__ $$aSCART-2026-0069
000007826 100__ $$aMeadowcroft, Rebecca L.
000007826 245__ $$aDecay Length of Slow MagnetoacousticWaves in the Solar Corona using SDO/AIA and Solo/EUI-HRIEUV
000007826 260__ $$c2026
000007826 520__ $$aSlow magnetoacoustic waves have been observed in the solar corona for decades; yet, existing theories do not fully explain the wide range of observed decay lengths, and measurements from different instruments frequently disagree. We present two events with simultaneous SDO/AIA and Solar Orbiter/EUI-HRIEUV observations of slow waves in sunspot-anchored coronal fan feathers. In Event 1, the LoS are separated by 16.2 degrees, while in Event 2, they are almost parallel. Using time-distance analysis, we identify waves with periods in the 3-minute band and quantify wave decay using the exponential folding length. When LoS are non-parallel, the ratio of decay lengths measured by the two instruments, λratio=λAIA/λEUI varies widely, with both λratio>1 and λratio<1 observed. However, when the LoS are almost parallel, the decay lengths agree with one another, and λratio≈1. These results show that the angle between the LoS and the wave propagation direction is key to determining the apparent decay of slow waves, a factor that has not yet been systematically accounted for. Since statistical studies of decay lengths constrain coronal energy-loss mechanisms, observational effects beyond simple projection must be corrected to reliably infer the underlying physical dissipation processes.
000007826 536__ $$a3PRODSIDCEXPLOIT, 3PRODP2SOC/$$c3PRODSIDCEXPLOIT, 3PRODP2SOC/$$f3PRODSIDCEXPLOIT, 3PRODP2SOC
000007826 594__ $$aNO
000007826 6531_ $$aEUI
000007826 6531_ $$awaves
000007826 6531_ $$acorona
000007826 700__ $$aNarang, Nancy
000007826 700__ $$aBerghmans, David
000007826 700__ $$aDominique, Marie
000007826 700__ $$aNakariakov, Valery M.
000007826 773__ $$pPhilosophical Transactions A
000007826 8560_ $$fmarie.dominique@ksb-orb.be
000007826 85642 $$ahttps://arxiv.org/abs/2607.25509
000007826 905__ $$asubmitted to
000007826 980__ $$aREFERD