The authors have previously discussed an improved method for obtaining the absolute solar brightness temperature using the new Moon as a calibration source. New measurements of the Sun-to-new Moon ratio at three frequencies near 36 GHz ()t = 8 mm) and also at two frequencies near 93 GHz ()t = 3 mm)
A method for investigating the brightness distribution near the solar limb at millimeter wavelengths
โ Scribed by P. Joensen; W. H. McCutcheon; W. L. H. Shuter
- Publisher
- Springer
- Year
- 1974
- Tongue
- English
- Weight
- 260 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0038-0938
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โฆ Synopsis
The brightness distribution near the solar limb has been investigated by means of a technique in which derivatives of drift scans of the Sun were compared with derivatives of drift scans of the Moon. The results obtained at 88.3 GHz (3.4 ram) indicate that the Sun is limb neutral within the uncertainty of our measurement. If limb brightening or darkening is present, it represents less than 1.6 ~ or 1.2 %, respectively, of the total power received from the Sun at this wavelength.
๐ SIMILAR VOLUMES
A computer program to convolve numerically any azimuthally symmetric, solar radial brightness distribution with standard antenna patterns of small half power bearnwidths has been used to find a solar brightness distribution which is a good fit to the eclipse curve obtained during the 7 March 1970 pa