Publication Year: 1981
DOI: https://doi.org/10.1086/190731
Abstract: view Abstract Content to find the ionization and excitation conditions for each atomic Graphics constituent. The emergent spectrum is calculated, and a trial and Metrics error approach is used to adjust the temperature distribution so Export that the emergent spectrum is in best agreement with the Citation observed one. The Show more
Authors:
Publication Year: 1993
DOI: https://doi.org/10.1086/172443
Abstract: view Abstract Content kinetic theory to determine the helium departures from local ionization Graphics balance. We calculate the helium spectra for each of our Metrics models and evaluate the role of helium in the energy Export transport. Also, we investigate the effects of coronal illumination on Citation the structure of Show more
Authors:
Publication Year: 1986
DOI: https://doi.org/10.1086/164342
Abstract: view Abstract Content by an umbral core atmospheric model that varies with time Graphics during the solar cycle; the observed center-limb variation can be Metrics accounted for by the properties of the model. Three umbral Export core models are presented, corresponding to the early, middle, and Citation late phases of Show more
Authors:
Publication Year: 1980
DOI: https://doi.org/10.1086/158467
Abstract: view Abstract Content the quiet-sun and active-region models. The results do not agree Graphics with the particle-heated theoretical models, and it is suggested that Metrics the models of Brown (1973) and Henoux and Nakagawa (1977, Export 1978) do not include an essential term for heat conduction Citation in their energy Show more
Authors:
Publication Year: 1976
DOI: https://doi.org/10.1086/190356
Abstract: view Abstract Content structure of the deepest observable layers; (2) absolute-intensity or flux Graphics measurements are needed in the range between 20 and 200 Metrics microns to determine whether the minimum solar temperature occurring between Export the photosphere and the chromosphere is as low as indicated Citation by present observations Show more
Authors:
Publication Year: 1973
DOI: https://doi.org/10.1086/152353
Abstract: view Abstract Content treated explicitly. The program is formulated in a general way Graphics and is currently being used for the analysis of other Metrics atomic systems as well. The present calculation of the continuous Export absorption and emission throughout the spectrum takes into account the Citation non-LTE contributions of Show more
Authors:
Publication Year: 1991
DOI: https://doi.org/10.1086/170399
Abstract: view Abstract Content These models explain the average quiet sun and also the Graphics entire range of variability of the Ly-alpha lines. The relations Metrics between the downward energy flux, the pressure of the transition Export region, and the different hydrogen emission are described. Publication: The Citation Astrophysical Journal Pub Show more
Authors:
Publication Year: 1987
DOI: DOI not available
Abstract: Preface Introduction perturbation Kalkofen Part II. Polarised Radiation: 9. A gentle introduction to methods polarised radiative transfer David E. Rees 10. Non-LTE polarised radiative W. transfer in special lines David E. Rees and Graham A. Kalkofen Murphy 11. Transfer of polarised radiation using 4x4 matrices E. 2. Landi Degli'Innocenti 12. Show more
Authors:
Publication Year: 1990
DOI: https://doi.org/10.1086/168803
Abstract: view Abstract Content equilibrium is assumed, and, in a first calculation, local mechanical Graphics heating and Joule heating are ignored. In a second model, Metrics some mechanical heating compatible with chromospheric energy-balance calculations is introduced. Export The models are computed for a partial non-LTE approach in Citation which radiation departs Show more
Authors:
Publication Year: 1983
DOI: https://doi.org/10.1086/161299
Abstract: view Abstract Content the range of profile variation is significantly larger than that Graphics covered by the models A-F of Vernazza, Avrett, and Loeser, Metrics especially in relation to the darkest profiles in which no Export core emission can be detected. Time-resolved spectra are used to Citation show that the Show more
Authors:
Publication Year: 2002
DOI: https://doi.org/10.1086/338770
Abstract: We report HD observe. There are several possibilities that may account for this 209458, reduced amplitude, including reaction of atomic sodium into molecular gases in and/or condensates, photoionization of sodium by the stellar flux, a the low primordial abundance of sodium, and the presence of clouds region high in the Show more
Authors:
Publication Year: 1984
DOI: https://doi.org/10.1086/162402
Abstract: view Abstract Content reasonably well for the observed radio continuum emission, the observed Graphics surface brightness distributions, and the emission fluxes in a variety Metrics of spectral lines. The detailed kinematics of the solution is Export less satisfactory in reproducing observed line profiles. It is suggested Citation that the observed, Show more
Authors:
Publication Year: 1982
DOI: https://doi.org/10.1086/160339
Abstract: view Abstract Content values less than or equal to 10 to the -8th Graphics solar mass per year. Although these mass loss rates are Metrics low in comparison to many previous estimates, it is shown Export that the wind models produce optical and ultraviolet emission roughly Citation consistent with observations. Show more
Authors:
Publication Year: 1990
DOI: https://doi.org/10.1086/169157
Abstract: view Abstract Content models are not compatible with the hypothesis that the continuum Graphics emission is caused by enhanced Balmer and Paschen hydrogen continua, Metrics and they present strong evidence instead that the emission is Export of photospheric origin and that its source is due to Citation H(-). The observation Show more
Authors:
Publication Year: 1965
DOI: https://doi.org/10.1137/0113006
Abstract: Previous article F. Y. H. Pao, Dynamical stress concentration in an elastic plate, CarrierGeorge J. Appl. Mech., 29 (1962), 299–305 0111.22102 CrossrefGoogle Scholar[5] G. F. F. Carrier, Integral equation boundary layer problems, 50 Jahre Grenzschichtforschung Carrierhttps://doi.org/10.1137/0113006PDFPDF Verlag Friedr. Vieweg and Son, Braunschweig, 1955, 13–20 0067.42802 Google PLUSBibTexSections Scholar[6] Ian N. Show more
Authors:
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