First simultaneous SST/CRISP and IRIS observations of a small-scale quiet Sun vortex
S.-H. Park, G. Tsiropoula, I. Kontogiannis, K. Tziotziou, E. Scullion,, J.G. Doyle

TL;DR
This study presents the first simultaneous observations of a small-scale quiet Sun vortex across multiple spectral lines, revealing high-speed upflows and vortex dynamics that contribute to chromospheric heating.
Contribution
It provides the first multi-line simultaneous observation of a small-scale quiet Sun vortex, demonstrating its dynamics and role in chromospheric heating.
Findings
Vortex observed simultaneously in H-alpha, Ca II 8542 A, and Mg II k lines.
High-speed upflows of 4-13 km/s with spiral and expanding motions.
Vortex associated with increased temperature and upward velocities in the chromosphere.
Abstract
Ubiquitous small-scale vortices have recently been found in the lower atmosphere of the quiet Sun in state-of-the-art solar observations and in numerical simulations. We investigate the characteristics and temporal evolution of a granular-scale vortex and its associated upflows through the photosphere and chromosphere of a quiet Sun internetwork region. We analyzed high spatial and temporal resolution ground- and spaced-based observations of a quiet Sun region. The observations consist of high-cadence time series of wideband and narrowband images of both H-alpha 6563 A and Ca II 8542 A lines obtained with the CRisp Imaging SpectroPolarimeter (CRISP) instrument at the Swedish 1-m Solar Telescope (SST), as well as ultraviolet imaging and spectral data simultaneously obtained by the Interface Region Imaging Spectrograph (IRIS). A small-scale vortex is observed for the first time…
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