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The semi-empirical models of the solar chromosphere are useful in the studyof the solar radio emission at millimeter - infrared wavelengths. However,current models do not reproduce the observations of the quiet sun. In this workwe present a theoretical study of the radiative transfer equation for foursemi- empirical models at these wavelengths. We found that the ChromosphericSolar Milimeter-wave Cavity (CSMC), a region where the atmosphere becomeslocally optically thin at millimeter wavelengths, is present in thesemi-empirical models under study. We conclude that the CSMC is a generalproperty of the solar chromosphere where the semi-empirical models showstemperature minimum.

The Chromospheric Solar Millimeter-wave Cavity; a Common Property in the Semi-empirical Models