The solar granulation in the vicinity of sunspots

Details The solar granulation in the vicinity of sunspots The solar granulation in the vicinity of sunspots

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...197..306s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 197, no. 1-2, May 1988, p. 306-310.

Astronomy and Astrophysics

Astrophysics

14

Photosphere, Solar Granulation, Sunspots, Astronomical Photometry, Power Spectra, Spectrum Analysis

Scientific paper

The mean size of the granulation close to sunspots is about 10 percent smaller than the corresponding value in the normal photosphere. The percentage of small granules increases steadily over a distance of about 30 arcsedc, as one approaches the sunspots. The observed rms intensity-contrast of the granulation at distances of less than 10 arcse to the penumbra is lower than in the quiet photosphere. This is the result of a power spectrum analysis of 11 white light pictures of different sunspots taken in 1980 with the 40 cm Newtonian Telescope of the Kiepenheuer-Institut operated at the Observatorio del Teide, Tenerife.

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