New Observations of Oscillating Coronal Loops

Details New Observations of Oscillating Coronal Loops New Observations of Oscillating Coronal Loops

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh11a0704r&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH11A-0704

Physics

7509 Corona, 7519 Flares

Scientific paper

One of the most promising discoveries of the TRACE mission is the first observations of transverse oscillations in coronal loops (Aschwanden et al 1999, Nakariakov et al 1999). Loops are set into motion from nearby flares, oscillate with a well defined frequency and decay on a time scale of 10 minutes. While the theoretical study of MHD waves in the corona has a long history, observational support has dramatically increased over the past 10 years as coronal instruments have improved. The transverse oscillations have been identified as standing kink modes for the 14-July-1998 observations cited above. In this paper we present clear evidence for a decaying global kink modes observed by TRACE on 15-Apr-2001. Six different loops have been observed to oscillate with a frequency in the range: 15-20 mHz (compared with 4 mHz for 14-July-1998) and a decay time in the range: 8-23 minutes (compared with 11 minutes for the earlier event). The implications for these results for coronal diagnostics and solar coronal seismology will be discussed.

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