Enhanced three-minute oscillation above a sunspot during a solar flare

Wang, Y., Fletcher, L. , Mulay, S. , Ji, H. and Cao, W. (2024) Enhanced three-minute oscillation above a sunspot during a solar flare. Astrophysical Journal, 961(2), 231. (doi: 10.3847/1538-4357/ad10a9)

Abstract

Three-minute oscillations are a common phenomenon in the solar chromosphere above a sunspot. Oscillations can be affected by the energy release process related to solar flares. In this paper, we report on an enhanced oscillation in flare event SOL2012-07-05T21:42 with a period of around 3 minutes that occurred at the location of a flare ribbon at a sunspot umbral–penumbral boundary and was observed in both chromospheric and coronal passbands. An analysis of this oscillation was carried out using simultaneous ground-based observations from the Goode Solar Telescope at the Big Bear Solar Observatory and space-based observations from the Solar Dynamics Observatory. A frequency shift was observed before and after the flare, with the running penumbral wave that was present with a period of about 200 s before the flare coexisting with a strengthened oscillation with a period of 180 s at the same locations after the flare. We also found a phase difference between different passbands, with the oscillation occurring from high-temperature to low-temperature passbands. Theoretically, the change in frequency was strongly dependent on the variation of the inclination of the magnetic field and the chromospheric temperature. Following an analysis of the properties of the region, we found the frequency change was caused by a slight decrease of the magnetic inclination angle with respect to the local vertical. In addition, we suggest that the enhanced 3 minute oscillation was related to the additional heating, maybe due to the downflow, during the EUV late phase of the flare.

• Item Type: Articles

Additional Information

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R&D Program of China 2021YFA1600502 (2021YFA1600500);
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• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Fletcher, Professor Lyndsay and Mulay, Dr Sargam and Wang, Ms Ya
• Authors: Wang, Y., Fletcher, L., Mulay, S., Ji, H., and Cao, W.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Research Group: Astronomy and Astrophysics
• Journal Name: Astrophysical Journal
• Journal Abbr.: ApJ
• Publisher: The American Astronomical Society
• ISSN: 0004-637X
• ISSN (Online): 1538-4357
• Copyright Holders: Copyright: © 2024 The Author(s)
• First Published: First published in Astrophysical Journal 961(2): 231
• Publisher Policy: Reproduced under a Creative Commons licence

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
306515		PHAS A&A Group STFC Consolidated	Lyndsay Fletcher	Science and Technology Facilities Council (STFC)	ST/T000422/1	P&S - Physics & Astronomy
317627		Solar Physics at the University of Glasgow	Lyndsay Fletcher	Science and Technology Facilities Council (STFC)	ST/X000990/1	P&S - Physics & Astronomy