Thermal Maps of Sunspots and the Quiet Sun

Details Thermal Maps of Sunspots and the Quiet Sun Thermal Maps of Sunspots and the Quiet Sun

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.8103l&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #81.03; Bulletin of the American Astronomical Society, Vol. 24, p.1252

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present images of sunspots, surrounding plage, quiet Sun, and the solar limb made at 4.8, 12.4, and 18 microns. These are basically thermal maps, the infrared intensity being nearly linearly proportional to temperature at these wavelengths. We believe these to be the most detailed thermal images to date of the solar photosphere. Thermal structure within sunspot penumbrae and the surrounding plage is evident in several images, although umbrae appear homogeneous, at least down to the approximately 2'' diffraction limit of the telescope at 12 microns. We find the temperature of penumbrae to be roughly 5% less than that of the quiet Sun, and umbrae to be about 25% less. Images of the quiet Sun show spatial thermal fluctuations of about 2% in patterns that change slowly with time. The measurements were made with the NSO's windowless, filled-aperture 1.6 m McMath-Pierce Solar Telescope, which fed the infrared image to a cryogenically-cooled 58x62 Si:Ge camera system built by D. Gezari.

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