Korsos, M.B., Romano, P., Morgan, H. et al. (3 more authors) (2020) Differences in periodic magnetic helicity injection behaviour between flaring and non-flaring active regions : case study. Astrophysical Journal Letters, 897 (2). L23. ISSN 2041-8205
Abstract
The evolution of magnetic helicity has a close relationship with solar eruptions and is of interest as a predictive diagnostic. In this case study, we analyze the evolution of the normalized emergence, shearing, and total magnetic helicity components in the case of three flaring and three non-flaring active regions (ARs) using Spaceweather Helioseismic Magnetic Imager Active Region Patches vector magnetic field data. The evolution of the three magnetic helicity components is analyzed with wavelet transforms, revealing significant common periodicities of the normalized emergence, shearing, and total helicity fluxes before flares in the flaring ARs. The three non-flaring ARs do not show such common periodic behavior. This case study suggests that the presence of significant periodicities in the power spectrum of magnetic helicity components could serve as a valuable precursor for flares.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020. The American Astronomical Society. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Solar flares; Solar activity; Solar active region magnetic fields; Sunspots; Solar active regions; Space weather |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield) |
Funding Information: | Funder Grant number Science and Technology Facilities Council ST/M000826/1 The Royal Society IE161153 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 24 Jun 2020 06:39 |
Last Modified: | 29 Jul 2020 09:25 |
Status: | Published |
Publisher: | American Astronomical Society |
Refereed: | Yes |
Identification Number: | 10.3847/2041-8213/ab9d7a |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:162373 |