Other
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991chjss..11..241d&link_type=abstract
Chin. J. Space Sci., Vol. 11, No. 4, p. 241 - 250
Other
Sun: Center-To-Limb Variation, Solar Atmosphere: Models
Scientific paper
Spectral lines of hydrogen and ionized calcium, as well as their center-to-limb variations, observed at Kitt Peak National Soalr Observatory, are used to diagnose the VAL-C', quiet Sun atmospheric model. The PANDORA computer program is used to perform the detailed non-LTE model calculations, especially for hydrogen and calcium. The main discrepanicies between the computed spectral lines and the observed data are: (1) The residual intensity in Hβ and λ8498 line centers is evidently higher, while that in Ca II H and K lines are relatively lower than the observed values. (2) The center-to-limb enhancement coefficient of the residual intensities of Hβ, and all the Ca II lines (resonance and infrared lines) near Δλ = 0.5 Å is a little larger than indicated by the observation. However, all other spectral features observed can be reproduced fairly well. Finally, the possible causes which can make the computed values deviate from the oberved ones is discussed, and a comment on revising the VAL-C' model is given.
Ding Mingde
Fang Cheng
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