A model of a penumbral chromosphere |
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Authors: | H S Yun H A Beebe W E Baggett |
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Institution: | (1) Department of Astronomy, Seoul National University, Seoul, Korea;(2) Department of Astronomy, New Mexico State University, Las Cruces, New Mexico, U.S.A. |
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Abstract: | A semi-empirical 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 Caii K, H, and 8498 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 overlying column mass m
0 of 8 × 10–6 g cm–2 which also agrees with the observed K3/H3 intensity ratio of 1.22.This work was supported by the US-Republic of Korea Cooperative Science Program (K-53). |
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