Abstract
It is usually believed that the radio optical depth of the layer h* where the temperature equals the brightness temperature is independent of the frequency. This assumption is criticized from the theoretical point of view and the behaviour of τ(h*) as a function of the frequency v is computed for two different solar models.
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Chiuderi Drago, F. On the radio optical depth of the layer where the temperature equals the brightness temperature. Sol Phys 27, 132–136 (1972). https://doi.org/10.1007/BF00151776
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DOI: https://doi.org/10.1007/BF00151776