Transverse oscillations in coronal loops observed with TRACE

Details Transverse oscillations in coronal loops observed with TRACE Transverse oscillations in coronal loops observed with TRACE

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh11a0703s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH11A-0703

Physics

7509 Corona, 7519 Flares

Scientific paper

TRACE discovered transverse oscillations in coronal loops associated with a flare three years ago, and until recently only two such events were known. We have now identified a total of 17 events that trigger some form of loop oscillations. Oscillation periods are estimated to range over a factor of ~ 15, with most values between 2 and 7 min. The oscillations are excited by filament destabilizations or flares (in 6%\ of the 255 flares inspected, ranging from about C3 to X2). Oscillations occur in loops that close within an active region, or in loops that connect an active region to a neighboring region or to a patch of strong flux in the quiet Sun. Some magnetic configurations are particularly prone to exhibit oscillations: two active regions showed two, and one region even three, distinct intervals with loop oscillations. The loop oscillations are not a resonance that builds up: oscillations in loops that are excited along their entire length are likely to be near the fundamental resonance mode because of that excitation profile, but asymmetrically excited oscillations clearly show propagating waves that are damped too quickly to build up a resonance, and some cases show multiple frequencies. We discuss evidence that all oscillating loops lie near magnetic separatrices that outline the large-scale topology of the field. Often the oscillations occur in conjunction with gradual adjustments in loop positions in response to the triggering event. We discuss the observations in the context of two models, and evaluate the contraints on coronal properties that can be deduced from them. >http://vestige.lmsal.com/TRACE/POD/TRACEoscillations.html

Affiliated with

Also associated with

No associations

Rating

Transverse oscillations in coronal loops observed with TRACE does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Transverse oscillations in coronal loops observed with TRACE, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transverse oscillations in coronal loops observed with TRACE will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1379774