Electronic Resource
Springer
Solar physics
92 (1984), S. 145-151
ISSN:
1573-093X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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 λ8498 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00157241
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