Observations of the continuum radio emission from the undisturbed Sun at a wavelength of 8.7 meters |
| |
Authors: | Ch V Sastry |
| |
Institution: | (1) Indian Institute of Astrophysics, 560034 Bangalore, India |
| |
Abstract: | 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|