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Flare-generated coronal loop oscillations: A tool for MHD coronal seismology
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UNSPECIFIED (2000) Flare-generated coronal loop oscillations: A tool for MHD coronal seismology. In: International Workshop on Waves in Dusty, Solar, and Space Plasmas, LEUVEN, BELGIUM, MAY 22-26, 2000. Published in: WAVES IN DUSTY, SOLAR, AND SPACE PLASMAS, 537 pp. 264-270. ISBN 1-56396-962-9. ISSN 0094-243X.
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Abstract
Quasi-periodical oscillations of positions of coronal loops were observed in the extreme- ultraviolet band (171A, FeIX) with the imaging telescope onboard the TRACE spacecraft. Oscillating transversal displacements (swinging) of a long (similar to 130 Mm) thin (diameter similar to2 Mm) bright loop, were detected. The oscillations were excited by a flare (14th July 1998 at about 12:55 UT) at distance of about 60 Mm from the loop. The frequency of the oscillations was about 4 mHz (the period about 265 s) and was determined by the wavelet analysis. Neighbouring perpendicular slits show synphase temporal behaviour, suggesting that the oscillations are produced by a Link global fast magnetoacoustic mode of the loop. With this interpretation, we determine the kink speed in the loop as 1040 km/s, which gives the Alfven speed of about 770+/-40 km/s.
The detection and analysis of post-flare oscillations of coronal loops provides us with an efficient tool for indirect determination of coronal parameters, e.g. the magnetic field found to be of about 20 G.
Item Type: | Conference Item (UNSPECIFIED) | ||||
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Subjects: | Q Science > QC Physics | ||||
Series Name: | AIP CONFERENCE PROCEEDINGS | ||||
Journal or Publication Title: | WAVES IN DUSTY, SOLAR, AND SPACE PLASMAS | ||||
Publisher: | AMER INST PHYSICS | ||||
ISBN: | 1-56396-962-9 | ||||
ISSN: | 0094-243X | ||||
Editor: | Verheest, F and Goossens, M and Hellberg, MA and Bharuthram, R | ||||
Official Date: | 2000 | ||||
Dates: |
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Volume: | 537 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 264-270 | ||||
Publication Status: | Published | ||||
Title of Event: | International Workshop on Waves in Dusty, Solar, and Space Plasmas | ||||
Location of Event: | LEUVEN, BELGIUM | ||||
Date(s) of Event: | MAY 22-26, 2000 |
Data sourced from Thomson Reuters' Web of Knowledge
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