Brightness temperature and size of the quiet Sun at 34.5 MHz
Indian Institute of Astrophysics, Bangalore, 560 034, India e-mail: firstname.lastname@example.org
Accepted: 17 June 2004
We present observations of the quiet Sun made at 34.5 MHz during the solar minimum period June–July 1986 and May–June 1987 with the Gauribidanur radio telescope and a grating array. The brightness temperature of the quiet Sun varied from 105 K to 105 K and the East–West diameter from 39 to 66 arcmin during the above periods. Only a weak inverse correlation is found to exist between the brightness temperature and the diameter of the quiet Sun and it does not strongly support the scattering hypothesis used to explain the low brightness temperature of the quiet Sun at decametric wavelengths.
Key words: Sun: radio radiation / Sun: corona / radiation mechanisms: thermal / scattering
© ESO, 2004