Oscillations in sunspots near the solar limb

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

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..212m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. 212-218.

Astronomy and Astrophysics

Astrophysics

2

Chromosphere, Line Spectra, Solar Limb, Solar Oscillations, Sunspots, H Alpha Line, Periodic Variations, Solar Spectra, Spatial Distribution

Scientific paper

Using sunspot-spectrograms near the solar limb it is possible to determine the height of the formation of selected strong (chromospheric) lines by micrometric distance measurements. The time sequences of H-alpha and NaD line spectra have been analyzed to check the possibility of a time variation in the height of formation of these lines. Periods in the 3 min range, but also longer periods of about 10 min or more, have been found. The amplitude of the height variation is the range Delta-h (rms) = 100-200 km. This is a new method to study oscillations in sunspots, without making use of intensity or velocity variations but with a low spatial information.

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