Size and temperature of umbral dots

Details Size and temperature of umbral dots Size and temperature of umbral dots

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...156..347g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 156, no. 1-2, Feb. 1986, p. 347-353.

Astronomy and Astrophysics

Astrophysics

48

Solar Temperature, Sunspots, Umbras, Astronomical Photometry, Diameters

Scientific paper

In 12 white light broad band pictures of 6 different sunspots, taken in 1980 and 1981 with the 40 cm Newtonian Vacuum Telescope operated at the Observatorio del Teide (Iazaña), the authors identified nearly 100 umbral dots and attempted to derive their temperature and diameter. They found strong evidence that the diameter of the dots is in the range 0arcsec.4 to 0arcsec.9 and the temperature is several 100K up to more than 1000K cooler than the photosphere.

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