| Issue |
A&A
Volume 426, Number 1, October IV 2004
|
|
|---|---|---|
| Page(s) | 329 - 331 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361:20047120 | |
| Published online | 05 October 2004 | |
Research Note
Brightness temperature and size of the quiet Sun at 34.5 MHz
Indian Institute of Astrophysics, Bangalore, 560 034, India e-mail: subra@iiap.res.in
Received:
22
January
2004
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
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