Flare-generated coronal loop oscillations: A tool for MHD coronal seismology
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.Full text not available from this repository.
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)|
|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|
|Editor:||Verheest, F and Goossens, M and Hellberg, MA and Bharuthram, R|
|Number of Pages:||7|
|Page Range:||pp. 264-270|
|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|
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