Physics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...52..327c&link_type=abstract
Solar Physics, vol. 52, May 1977, p. 327-335.
Physics
15
Emission Spectra, Solar Spectra, Stellar Models, Sunspots, Ultraviolet Spectra, Far Ultraviolet Radiation, Gas Pressure, Line Spectra, Penumbras, Radiative Heat Transfer, Umbras
Scientific paper
Absolute intensities of emission lines in the wavelength range from 1200 A to 1817 A from the large sunspot in McMath region 12510 near the disk center are presented. The intensities are averaged across the umbra and penumbra of the sunspot. The observations were made with the NRL slit spectrograph on Skylab. Emission measures are derived from the measured intensities. Assuming a balance between the divergence of the conductive energy flux and the radiative energy losses, a self-consistent model of the lower transition region in the sunspot is constructed. The model gives a constant pressure of about 0.19 dyn/sq cm and a conductive flux which decreases approximately one order of magnitude between 200,000 and 40,000 K. The temperature gradient is relatively constant, increasing slowly with decreasing temperature
Cheng Chung-Chieh
Kjeldseth Moe Olav
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