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Coronal Alfvén speed determination : consistency between seismology using AIA/SDO transverse loop oscillations and magnetic extrapolation
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Verwichte, E. (Erwin), Van Doorsselaere, Tom, Foullon, C. (Claire) and White, R. S. (2013) Coronal Alfvén speed determination : consistency between seismology using AIA/SDO transverse loop oscillations and magnetic extrapolation. Astrophysical Journal, Volume 767 (Number 1). Article: 16. doi:10.1088/0004-637X/767/1/16 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/767/1/16
Abstract
Two transversely oscillating coronal loops are investigated in detail during a flare on the 6th September 2011 using data from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics
Observatory (SDO).We compare two independent methods to determine the Alfvén speed inside these loops. Through the period of oscillation and loop length information about the Alfvén speed inside each loop is deduced seismologically. This is compared with the Alfvén speed profiles deduced from magnetic extrapolation and spectral methods using AIA bandpass. We find that for both loops the two methods are consistent. Also, we find that the average Alfvén speed based on loop travel time is not necessarily a good measure to compare with the seismological result, which explains earlier reported discrepancies. Instead, the effect of density and magnetic stratification on the wave mode has to be taken into account. We discuss the implications of combining seismological, extrapolation and spectral methods in deducing the physical properties of coronal loops.
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): | Magnetohydrodynamics, Sun -- Corona, Solar magnetic fields, Solar oscillations | ||||
Journal or Publication Title: | Astrophysical Journal | ||||
Publisher: | IOP Publishing | ||||
ISSN: | 0004-637X | ||||
Official Date: | 10 April 2013 | ||||
Dates: |
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Volume: | Volume 767 | ||||
Number: | Number 1 | ||||
Page Range: | Article: 16 | ||||
DOI: | 10.1088/0004-637X/767/1/16 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Date of first compliant deposit: | 24 December 2015 | ||||
Date of first compliant Open Access: | 24 December 2015 | ||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Katholieke Universiteit te Leuven (1970- ), Fonds voor Wetenschappelijk Onderzoek—Vlaanderen, Seventh Framework Programme (European Commission) (FP7) | ||||
Grant number: | ERG 276808 (FP7), ST/I003649/1 (STFC) |
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