Sunspot Oscillations and Acoustic Wave Propagation

Details Sunspot Oscillations and Acoustic Wave Propagation Sunspot Oscillations and Acoustic Wave Propagation

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.0401b&link_type=abstract

American Astronomical Society, SPD meeting #34, #04.01; Bulletin of the American Astronomical Society, Vol. 35, p.810

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Observations with the Coronal Diagnostic Spectrometer of 3 min oscillations in sunspot umbrae support the hypothesis that they are caused by upwardly propagating acoustic waves. This is evident from the asymmetry of oscillation amplitudes in the red and blue wings of spectral lines, where the oscillations are decidedly more pronounced in the blue than in the red line wing. Additional evidence include the fact that the relation between oscillations in intensity and velocity agree with that predicted for an acoustic wave with regard to phase as well as magnitude. Finally, the observed phase difference between lines formed at different temperatures points to an upward propagating disturbance, and the value of dominant frequency of the oscillations, close to 6 mHz, is above the acoustic cutoff frequency in the sunspot atmosphere. SOHO is a mission of international cooperation between ESA and NASA. This study was supported by the Research Council of Norway.

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