Oscillations in sunspots near the solar limb

Details Oscillations in sunspots near the solar limb Oscillations in sunspots near the solar limb

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..273m&link_type=abstract

In ESA, Seismology of the Sun and Sun-Like Stars p 273-274 (SEE N89-25819 19-92)

Physics

1

Solar Activity Effects, Solar Limb, Solar Oscillations, Sunspots, Solar Spectra, Spectrograms, Spectrum Analysis

Scientific paper

Sunspot-spectrograms near the solar limb were used to determine the height of the formation of selected strong (chromospheric) lines by micrometric distance measurements. The time sequences of H alpha and Na D line spectra were analyzed to check the possibility of a time variation in the height of formation of these lines. Results show periods in the 3 min range, but also longer periods. The amplitude of the height variation is in the range delta h (rms)=100 to 200 km. This method to study oscillations in sunspots does not need to use of intensity velocity variations.

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