Physics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...92..145y&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 92, May 1984, p. 145-151. Research supported by the U.S.-Republic of Korea Cooperative Scie
Physics
9
Atmospheric Models, Chromosphere, Line Spectra, Penumbras, Sunspots, Calcium, H Lines, K Lines, Temperature Distribution
Scientific paper
A semiempirical model of a penumbral chromosphere is presented which represents a specific region of the penumbra located approximately one-fourth the distance outward from the umbra-penumbra interface. The model is based on simultaneous observations of high-resolution spectra of Ca II K, H, and 8498 A made over a sunspot penumbra (SPO 5007) with the Echelle Spectrograph at the Vacuum Tower Telescope at Sacramento Peak Observatory on 18 December, 1979. Spectral profiles were calculated using a non-LTE line formation procedure with various chromospheric models where the optimum model is determined by matching the synthesized profiles with the observational features. The best fit yields a model with an overlying column mass of 8 x 10 to the -6th g/sq cm which also agrees with the observed K3/H3 intensity ratio of 1.22.
Baggett Wayne E.
Beebe Herbert Alonzo
Yun Hong Sik
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