P-mode absorption in the giant active region of 10 March, 1989

Details P-mode absorption in the giant active region of 10 March, 1989 P-mode absorption in the giant active region of 10 March, 1989

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..129...83b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 129, Sept. 1990, p. 83-94.

Computer Science

Sound

39

Power Spectra, Solar Activity, Solar Oscillations, Sound Waves, Sunspots, Cylindrical Coordinates, Fourier Transformation, Solar Flares, Solar Magnetic Field

Scientific paper

The interaction of solar p-mode oscillations with solar active regions has been studied in the case of the velocity oscillations observed in the vicinity of NOAA region 5359 on March 10, 1989. A maximum of nearly 70 percent of the power of incident high-degree modes is noted to be absorbed by this exceptionally large sunspot group. The occurrence of a major flare within this region during the observing sequence furnished a unique opportunity for testing the hypothesis that flares can excite photospheric acoustic waves. A search for acoustic 'pulses' emanating from the flare leads no detection of pulses, to a level of about 20 percent of the background power.

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