[P-EM14] Frontiers in solar physics

[PEM14-P03] Solar Active Region Coronal Jets: Hidden-onset Jets

*Alphonse Sterling¹, Ronald Moore^2,1, Navdeep Panesar^3,4 (1.NASA/MSFC, Huntsville, AL, 35812, USA, 2.Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, Huntsville, AL 35805, USA, 3.Bay Area Environmental Research Institute, NASA Research Park, Moffett Field, CA 94035, USA, 4..Lockheed Martin Solar and Astrophysics Laboratory, 3251 Hanover Street, Building 252, Palo Alto, CA 94304, USA)

Keywords:Sun: Coronal Jets, Sun: Active Regions, Sun: Filament Eruptions, Sun: Magnetic Fields

Solar quiet- and coronal-hole region coronal jets frequently clearly originate from erupting minifilaments, but active-region jets often lack an obvious erupting-minifilament source. We observe a coronal-jet-productive active region (AR), AR12824, over 2021 May 22 0–8 UT, primarily using Solar Dynamics Observatory (SDO) Atmospheric Imaging Array (AIA) EUV images and SDO/Helioseismic and Magnetic Imager magnetograms. Jets were concentrated in two locations in the AR: on the south side and on the northwest side of the AR’s lone large sunspot. The south-location jets are oriented so that we have a clear view of the jets’ origin low in the atmosphere: their source is clearly minifilaments erupting from locations showing magnetic flux changes/cancelations. After erupting a projected distance ~5′′ away from their origin site, the minifilaments erupt outward onto far-reaching field as part of the jet’s spire, quickly losing their minifilament character. In contrast, the northwest-location jets show no clear erupting minifilament, but the source site of those jets are obscured along our line of sight by absorbing chromospheric material. EUV and magnetic data indicate that the likely source sites were ~15′′ from where the we first see the jet spire; thus, an erupting minifilament would likely lose its minifilament character before we first see the spire. We conclude that such AR jets could work like non-AR jets, but the erupting-minifilament jet source is often hidden by obscuring material. Another factor is that magnetic eruptions making some AR jets carry only a harder-to-detect comparatively thin (∼1′′–2′′) minifilament “strand.” A full report appears in Sterling et al. (2024, ApJ, 960, 109). This work was supported by the NASA Science Mission Directorate's HSR and HGI programs, and through the NASA/MSFC Hinode Project.