Sunspot Transition Region Oscillations

Details Sunspot Transition Region Oscillations Sunspot Transition Region Oscillations

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..207b&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

Astronomy and Astrophysics

Astrophysics

Scientific paper

Based on the SOHO joint observing programme for velocity fields in sunspots, we have detected 3 min transition region umbral oscillations in six sunspots. Simultaneous recordings of O V lambda 629, NV lambdas 1238, 1242 and Si I lambda 1260 with the SUMER instrument allow us to compare the transition region oscillations with the 3 min chromospheric oscillations above the sunspot. We investigate the amplitudes and phase relations of the oscillations in peak line intensity, line-of-sight velocity and line width. The spatial distributions of power in the 3 min oscillations, both in intensity and line-of-sight velocity, are presented. The observations show that the maxima in peak line intensity are nearly, but not exactly in phase with the maxima in velocity directed towards the observer. The suggestion that the waves are upward propagating acoustic waves is confronted with observations.

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