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The morphology of average solar flare time profiles from observations of the Sun's lower atmosphere
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Kashapova, Larisa K., Broomhall, Anne-Marie, Larionova, Alena I., Kupriyanova, E. G. and Motyk, Ilya D. (2021) The morphology of average solar flare time profiles from observations of the Sun's lower atmosphere. Monthly Notices of the Royal Astronomical Society, 502 (3). pp. 3922-3931. doi:10.1093/mnras/stab276 ISSN 1745-3933.
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WRAP-morphology-average-solar-flare-time-profiles-2021.pdf - Accepted Version - Requires a PDF viewer. Download (1917Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stab276
Abstract
We study the decay phase of solar flares in several spectral bands using a method basedon that successfully applied to white light flares observed on an M4 dwarf. We selectedand processed 102 events detected in the Sun-as-a-star flux obtained with SDO/AIAimages in the 1600 ̊A and 304 ̊A channels and 54 events detected in the 1700 ̊A channel.The main criterion for the selection of time profiles was a slow, continuous flux decaywithout significant new bursts. The obtained averaged time profiles were fitted withanalytical templates, using different time intervals, that consisted of a combination oftwo independent exponents or a broken power law. The average flare profile observedin the 1700 ̊A channel decayed more slowly than the average flare profile observed onthe M4 dwarf. As the 1700 ̊A emission is associated with a similar temperature to thatusually ascribed to M dwarf flares, this implies that the M dwarf flare emission comesfrom a more dense layer than solar flare emission in the 1700 ̊A band. The coolingprocesses in solar flares were best described by the two exponents model, fitted overthe intervals t1=[0, 0.5]t1/2and t2=[3, 10]t1/2wheret1/2is time taken for the profileto decay to half the maximum value. The broken power law model provided a goodfit to the first decay phase, as it was able to account for the impact of chromosphericplasma evaporation, but it did not successfully fit the second decay phase.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
Library of Congress Subject Headings (LCSH): | Solar flares , Solar photosphere , Solar chromosphere , Solar atmosphere | |||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||
Publisher: | Oxford University Press | |||||||||
ISSN: | 1745-3933 | |||||||||
Official Date: | April 2021 | |||||||||
Dates: |
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Volume: | 502 | |||||||||
Number: | 3 | |||||||||
Page Range: | pp. 3922-3931 | |||||||||
DOI: | 10.1093/mnras/stab276 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Larisa K Kashapova, Anne-Marie Broomhall, Alena I Larionova, Elena G Kupriyanova, Ilya D Motyk, The morphology of average solar flare time profiles from observations of the Sun’s lower atmosphere, Monthly Notices of the Royal Astronomical Society, 2021;, stab276, is available online at: https://doi.org/10.1093/mnras/stab276 | |||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||
Date of first compliant deposit: | 5 February 2021 | |||||||||
Date of first compliant Open Access: | 5 February 2021 | |||||||||
RIOXX Funder/Project Grant: |
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