Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..537..264n&link_type=abstract
WAVES IN DUSTY, SOLAR, AND SPACE PLASMAS. AIP Conference Proceedings, Volume 537, pp. 264-270 (2000).
Physics
5
Macroinstabilities
Scientific paper
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 (~130 Mm) thin (diameter ~2 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. Neighboring perpendicular slits show synphase temporal behavior, suggesting that the oscillations are produced by a kink 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 Alfvén 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. .
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