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Solar Atmospheric Heating Due to Small-scale Events in an Emerging Flux Region
Stockholm University, Faculty of Science, Department of Astronomy.
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Number of Authors: 52023 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 958, no 1, article id 54Article in journal (Refereed) Published
Abstract [en]

We investigate the thermal, kinematic, and magnetic structure of small-scale heating events in an emerging flux region (EFR). We use high-resolution multiline observations (including Ca ii 8542 angstrom, Ca ii K, and the Fe i 6301 angstrom line pair) of an EFR located close to the disk center from the CRISP and CHROMIS instruments at the Swedish 1 m Solar Telescope. We perform non-LTE inversions of multiple spectral lines to infer the temperature, velocity, and magnetic field structure of the heating events. Additionally, we use the data-driven Coronal Global Evolutionary Model to simulate the evolution of the 3D magnetic field configuration above the events and understand their dynamics. Furthermore, we analyze the differential emission measure to gain insights into the heating of the coronal plasma in the EFR. Our analysis reveals the presence of numerous small-scale heating events in the EFR, primarily located at polarity inversion lines of bipolar structures. These events not only heat the lower atmosphere but also significantly heat the corona. The data-driven simulations, along with the observed enhancement of currents and Poynting flux, suggest that magnetic reconnection in the lower atmosphere is likely responsible for the observed heating at these sites.

Place, publisher, year, edition, pages
2023. Vol. 958, no 1, article id 54
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-224257DOI: 10.3847/1538-4357/acfd2bISI: 001100689500001Scopus ID: 2-s2.0-85177593109OAI: oai:DiVA.org:su-224257DiVA, id: diva2:1817241
Available from: 2023-12-05 Created: 2023-12-05 Last updated: 2023-12-05Bibliographically approved

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Leenaarts, Jorrit

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