A chromospheric temperature inversion and its implications on millimeter brightness distribution |
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| Authors: | Donald F Neidig Jr |
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| Institution: | (1) Dept. of Physics, Alliance College, 16403 Cambridge Springs, Pa., U.S.A.;(2) Present address: Dept. of Astronomy, Pennsylvania State University, 16802 University Park, Pa., U.S.A. |
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| Abstract: | The brightness temperature curve of the quiet Sun at millimeter wavelengths suggests a possible inversion in the mid-millimeter range. Interpreting this as a result of an actual inversion in the chromospheric temperature structure, and example of a model chromoshere is presented whose calculated temperature curve exhibits such an inversion. This model is then tested for radial brightness distribution at millimeter wavelengths. Comparing the calculated distributions at 3.2 mm and 6 mm with eclipse measurements made with parabolic cylinders at 3.2 mm and 8.6 mm shows qualitative agreement, allowing for instrumental smoothing. It is conluded that a chromospheric temperature inversion, either actual or effective, could account for the inversion suggested by millimeter data and also the complex brightness distributions measured during eclipses with parabolic cylinders. |
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