C62

Presentation Title:	Identification of chromospheric dynamical signatures in solar flares with the Daniel K. Inouye Solar Telescope
Author(s):	Spencer Riley

Abstract:

With the emergence of new high-resolution, high-cadence spectral data from the Daniel K. Inouye Solar Telescope, we can probe solar flare energetics and dynamics in the chromosphere on unprecedented small scales. We utilize available Ca II 854.2 nm spectral data to diagnose the dynamics of the flaring chromosphere. In addition, we co-aligned AIA 1600$\r{A}$ with DKIST observations to provide a history of localized heating in the vicinity of the spectral measurements. The aim is to characterize tens of thousands of spectra from a 27 December 2022 C4 solar flare into groups of similar spectral features via a hierarchical k-means algorithm and investigate how the spectral features vary during different stages of the localized heating events defined by AIA 1600$\r{A}$ lightcurves. We find that within a sixty-minute interval centered on the spectral observations, there are strong populations of double-peaked spectral groups in the early gradual phase of the localized heating. While red-enhanced asymmetric spectral groups have strong populations in the later gradual phase and the pre-heating phase.

---