Investigation of Active-Region Solar Jets Using High-Resolution Observations

by Dr Reetika Joshi (NASA/GSFC and GMU)

Friday 24 Oct 2025, 10:30 → 11:30 Europe/Stockholm

FC61 (AlbaNova Main Building)

Solar jets are collimated plasma ejections guided by magnetic field lines and detected in both hot (EUV) and cool (chromospheric) diagnostics, yet their triggering mechanisms and the link between hot and cool components remain uncertain. In this seminar, I will present a study of a sequence of active-region jets, tracing their formation and evolution from the photosphere to the corona using multithermal observations from ground-based and space-borne instruments. By combining high-resolution data from the Swedish 1-m Solar Telescope (SST) with observations from the Solar Dynamics Observatory (SDO), we analyzed jets originating from a mixed-polarity region located between the leading and trailing sunspots of an active region. Persistent flux emergence produced a long-lived mixed-polarity configuration observed as an arch filament system, while magnetic field extrapolation revealed a fan–spine topology with a magnetic null point. I will highlight the critical role of high-resolution SST observations in resolving fine-scale structures at jet footpoints, thereby uncovering key aspects of the triggering mechanisms that drive solar jets.