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We present two events with simultaneous Solar Dynamics Observatory\/Atmospheric Imaging Assembly (SDO\/AIA) and Solar Orbiter\/EUI-HRIEUV observations of slow waves in sunspot-anchored coronal fan feathers. In Event\u00a01, the lines of sight (LoS) are separated by 16.2\u2218, while in Event\u00a02, 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. For non-parallel LoS, the ratio of decay lengths measured by the two instruments, \u03bbratio=\u03bbAIA\/\u03bbEUI, varies widely, with both \u03bbratio&amp;gt;1 and \u03bbratio&amp;lt;1 observed. However, when the LoS are almost parallel, the decay lengths agree with one another, and \u03bbratio\u22481. 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.<\/jats:p>\n                  <jats:p>This article is part of the theme issue \u2018Transferable mechanisms in the oscillatory processes of solar and stellar flares\u2019.<\/jats:p>","DOI":"10.1098\/rsta.2025.0063","type":"journal-article","created":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T08:09:33Z","timestamp":1792656573000},"source":"Crossref","is-referenced-by-count":0,"title":["Decay length of slow magnetoacoustic waves in the solar corona using SDO\/AIA and SolO\/EUI-HRIEUV"],"prefix":"10.1098","volume":"384","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-0044-8587","authenticated-orcid":false,"given":"Rebecca L.","family":"Meadowcroft","sequence":"first","affiliation":[{"name":"Centre for Fusion, Space & Astrophysics, Physics Department, University of Warwick 1 , Coventry CV4 7AL, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9398-2063","authenticated-orcid":false,"given":"Nancy","family":"Narang","sequence":"additional","affiliation":[{"name":"STCE \u2013 SIDC, Royal Observatory of Belgium 2 , Ringlaan \u20133\u2013 Av. 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