Solar limb brightening at 820 microns
Abstract
The sun in 820 micron radiation is mapped, and strong radial brightening of the intensity profile is found. The east and west limbs show an intensity excess of about twice that of the quiet north and south limbs. This may be attributable to active regions near the east and west limbs. The radial brightening observed is as strong as that observed by others at 1.3 mm, and much stronger than that observed at 350 microns by still others. A strong general increase in gradual radial brightening with wavelength longward of 350 microns is thus indicated, and this is attributed to variations in the character of chromospheric fine structure above the temperature minimum region.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1984
- DOI:
- 10.1086/161710
- Bibcode:
- 1984ApJ...277..424L
- Keywords:
-
- Infrared Astronomy;
- Limb Brightening;
- Solar Flux Density;
- Solar Limb;
- Chromosphere;
- Radial Distribution;
- Solar Temperature;
- Solar Physics