Solar atmospheric activity—from large flares to small-scale events—provides key insights into fundamental physical processes, including magnetic reconnection and particle acceleration. Spectroscopic observations offer uniquely powerful diagnostics of plasma properties, placing strong constraints on theoretical models of the solar atmosphere.

Recent spectroscopic observations (e.g., with IRIS, Hinode/EIS, SPICE, FOXSI, MaGIXS, STIX, XSM, MinXSS) have driven significant advances in our understanding of atmospheric dynamics and energetics, while also revealing new challenges. Upcoming solar observatories will transform EUV spectroscopic coronal studies: the Multi-slit Solar Explorer (MUSE) will provide simultaneous EUV imaging and spectroscopy over a wide field of view through its innovative 35-slit design, while EUVST will offer comprehensive temperature coverage via its broad EUV/UV spectral range. We invite contributions investigating dynamic phenomena in the solar atmosphere using current coronal spectroscopic observations and/or advanced modeling, as well as studies that explore and prepare for the scientific opportunities enabled by these next-generation spectroscopic missions.