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Description
We report imaging spectroscopic observations of an M1.4 solar flare obtained during a coordinated observation between SUNRISE-III/SCIP and Domeless Solar Telescope (DST) at Hida Observatory, Kyoto University.
The flare that occurred on 2024 July 13 in NOAA Active Region 13738 exhibited a compact flare kernel located within a sunspot umbra.
SCIP performed rapid slit-scan observations over a 58" x 58" field of view around the umbra at a cadence of 40 s, covering infrared chromospheric lines, including Ca II 8498/8542 Å and K I D1.
At the same time, DST observed a wider (300" x 120") surrounding region with a cadence of 25 s in H$\alpha$, Ca II 8542 Å, and Na I D1/D2.
We investigate the temporal evolution and spectral characteristics of the umbral flare kernel by using simultaneous spectroscopic observations in multiple chromospheric lines.
Clear flare-related brightenings are detected in all chromospheric lines observed by SCIP and DST, while no significant enhancement is found in photospheric lines.
The high spatial resolution of SCIP reveals fine substructures within the kernel on spatial scales of order 1 Mm that are largely smeared out in ground-based observations alone.
The spectral profiles exhibit temporally and spatially varying Doppler shifts and line broadenings, indicating complex, fine-scale plasma motions in the chromosphere.