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A reconnection-driven magnetic flux cancellation and a quiet Sun Ellerman bomb
Stockholm University, Faculty of Science, Department of Astronomy.ORCID iD: 0000-0003-2359-9039
Stockholm University, Faculty of Science, Department of Astronomy.ORCID iD: 0000-0002-4640-5658
Number of Authors: 42023 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 521, no 3, p. 3882-3897Article in journal (Refereed) Published
Abstract [en]

The focus of this investigation is to quantify the conversion of magnetic to thermal energy initiated by a quiet Sun cancellation event and to explore the resulting dynamics from the interaction of the opposite-polarity magnetic features. We used imaging spectroscopy in the Hα line, along with spectropolarimetry in the Fe I 6173 Å and Ca II 8542 Å lines from the Swedish Solar Telescope (SST) to study a reconnection-related cancellation and the appearance of a quiet Sun Ellerman bomb (QSEB). We observed, for the first time, QSEB signature in both the wings and core of the Fe I 6173 Å line. We also found that, at times, the Fe I line-core intensity reaches higher values than the quiet Sun continuum intensity. From FIRTEZ-dz inversions of the Stokes profiles in Fe I and Ca II lines, we found enhanced temperature, with respect to the quiet Sun values, at the photospheric (log τc  = −1.5; ∼1000 K) and lower chromospheric heights (log τc  = −4.5; ∼360 K). From the calculation of total magnetic energy and thermal energy within these two layers, it was confirmed that the magnetic energy released during the flux cancellation can support heating in the aforesaid height range. Further, the temperature stratification maps enabled us to identify cumulative effects of successive reconnection on temperature pattern, including recurring temperature enhancements. Similarly, Doppler velocity stratification maps revealed impacts on plasma flow pattern, such as a sudden change in the flow direction. 

Place, publisher, year, edition, pages
2023. Vol. 521, no 3, p. 3882-3897
Keywords [en]
Sun: photosphere, Sun: chromosphere, Sun: magnetic fields
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-220560DOI: 10.1093/mnras/stad759ISI: 000983396000004Scopus ID: 2-s2.0-85160340013OAI: oai:DiVA.org:su-220560DiVA, id: diva2:1793991
Available from: 2023-09-04 Created: 2023-09-04 Last updated: 2023-09-04Bibliographically approved

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Pastor Yabar, Adurde la Cruz Rodríguez, Jaime

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