Oscillating hot loops observed by SUMER

Details Oscillating hot loops observed by SUMER Oscillating hot loops observed by SUMER

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508..465w&link_type=abstract

In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze

Physics

10

Solar Flares, Coronal Oscillations, Uv Radiation, X-Rays

Scientific paper

We report observations of Doppler shift oscillations in hot flare lines emitted from active region loops. The Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer on SOHO recorded spectra of limb active regions loops in several emission lines with formation temperatures from ~104 to 107K. The events were only detected in the hot flare lines, without any signature in lines formed around 2×106K. There is a large shift pulse of up to 190 km s-1 during the rising phase of the flux which is followed by two or three periods of strongly damped alternating red and blue shift oscillations with periods in the range 12-31 min. Slow mode standing waves match the observed period. However, the initial large Doppler shift pulse suggests that the waves are impulsively generated. Unlike the oscillating loops seen in the TRACE images, these Doppler shift oscillations are sometimes seen without an associated flare.

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