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Solar observations from millimeter to ultraviolet wavelengths show that thereis a temperature minimum between photosphere and chromosphere. Analysis basedon semi-empirical models locate this point at about 500 km over thephotosphere. The consistency of these models has been tested by means ofmillimeter to infrared observations.  In the present work, we show that variations of the theoretical radialtemperature profile near the temperature minimum impacts the brightnesstemperature at centimeter, submillimeter, and infrared wavelengths, but themillimeter wavelength emission remains unchanged. We found a region between 500and 1000 km over the photosphere that remains hidden to observations at thefrequencies under study in this work.

solar physics

The Relation between the Radial Temperature Profile in the Chromosphere  and the Solar Spectrum at Centimeter, Millimeter, Sub-millimeter, and  Infrared Wavelengths