The radiative relaxation time in the chromosphere |
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| Authors: | R G Giovanelli |
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| Institution: | (1) National Measurement Laboratory, CSIRO, 2070 Sydney, Australia |
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| Abstract: | The cooling effect of emission in the spectral lines, which dominates over continuous emission in the chromosphere and becomes important first around the temperature minimum, modifies greatly the radiative relaxation timet
r in the solar atmosphere. This rises from low photospheric values to a maximum of  8 min just aboveT
min, falls in the low chromosphere to 1.5 min because of line emission, but rises again to 6 min atT 7000–8400 K in the chromosphere where hydrogen ionization increases the specific heat. |
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