Observations of the continuum radio emission from the undisturbed Sun at a wavelength of 8.7 meters
- 29 Downloads
We have mapped the continuum emission from the undisturbed Sun at a wavelength of 8.7 m during 1981–1985 using the large decameter-wave radiotelescope at Gauribidanur, India with a resolution of 26 #x00D7; 38 arc min. During the period August 6–30, 1983, the Sun was exceptionally quiet at meter and decameter wavelengths, and we were able to make maps on several consecutive days. On these days the position of the centroid of the radio Sun agreed quite closely with the center of the optical Sun indicating that there is very little or no contribution from active regions. But the observed peak brightness temperature varied from 100 000 to 700 000 K. The half-power widths of the brightness distribution were in the range of 3 to 4R ⊙. The variations of the brightness temperature and the half-power widths are not correlate. It is therefore suggested that the variations of the brightness temperature are not caused by uniform density variations or due to scattering by an irregular corona.
KeywordsOptical Depth Solar Phys Brightness Temperature Radio Burst Continuum Emission
Unable to display preview. Download preview PDF.
- Aubier, M., Leblanc, Y., and Boischot, A.: 1971,Astron. Astrophys. 135, 141.Google Scholar
- House, L. L. and Illing, R. M. E.: 1982, in A. O. Benz and P. Zlobec (eds.),Proc. of the 4th CESRA Workshop on ‘Solar Noise Storms’, p. 99.Google Scholar
- Kai, K., Melrose, D. B., and Suzuki, S.: 1985, in D. J. McLean and N. R. Labrum (eds),Solar Radiphysics, Cambridge University Press, Cambridge, p. 415.Google Scholar
- McLean, D. J. and Melrose, D. B.: 1985,Solar Radiophysics, Cambridge University Press, Cambridge.Google Scholar
- Quarterly Bulletin of Solar Activity: 1983, Vol. 25, V-11.Google Scholar
- Sheridan, K. V. and McLean, D. J.: 1985,Solar Radiophysics, Cambridge University Press, Cambridge.Google Scholar
- Solar Geophysical Data: 1983, No. 469, Part 1.Google Scholar