The solar brightness temperature in the far infrared
Abstract
Measurements of absolute solar brightness have been obtained for a wide range of far-infrared and submillimeter wavelengths using a balloon-borne lamellar grating interferometer. An experiment covering the wavelength range 200-600 microns showed that at 200 microns the solar brightness temperature may reach a value of about 4100 K, a result not incompatible with the higher values of the temperature minimum derived from ultraviolet observations around 1600 A. The brightness temperature is constant between about 95 and 200 microns, corresponding to the flat temperature minimum of the photosphere/chromosphere transition region. Some of the spectra obtained have a spectral resolution better than 0.5/cm, allowing the detection of a number of stratospheric molecular absorption lines (H2O, O2, O3).
- Publication:
-
COSPAR Meeting
- Pub Date:
- June 1976
- Bibcode:
- 1976cosp.meetR....M
- Keywords:
-
- Brightness Temperature;
- Far Infrared Radiation;
- Infrared Astronomy;
- Solar Temperature;
- Submillimeter Waves;
- Balloon Sounding;
- Chromosphere;
- Gratings (Spectra);
- Line Spectra;
- Molecular Absorption;
- Photosphere;
- Solar Spectra;
- Spectrum Analysis;
- Solar Physics