Abstract
The experimental results of a previous paper (Raoult et al., 1979) are used to discuss the interpretation of the depression in brightness temperature associated with prominences observed on the disk at centimetric and millimetric wavelengths. It is shown that the UV observations of the prominence-corona transition region are in agreement with the radio data. This is one of the arguments to locate the origin of the radio depression in the prominence-corona transition region rather than in the coronal cavity above filaments. Millimetric observations of filaments give further constraints on prominence core physical conditions, not fulfilled in the presently available models.
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