The small-scale, quasi-periodic, disk component of solar radio radiation.
Abstract
Interferometric observations of the sun at wavelengths of 3.7 and 11 cm show that small-scale, quasi-periodic radio emission is coming from the sun. The periods occur in a band of periods with a midband frequency of 3.75 mHz and a bandwidth of 2.5 mHz. The peak-to-peak fluctuations in brightness temperature, lie between 4,000 and 500,000 K. The radio emission is less than about 10% linearly or circularly polarized; the angular size of the emitting regions is of the order of 10 seconds. The radio emission originates at the base of the chromosphere-corona transition region at approximately 2200 km above the level at which the optical depth at 5000 A is unity.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1974
- DOI:
- 10.1086/153116
- Bibcode:
- 1974ApJ...192..777L
- Keywords:
-
- Chromosphere;
- Solar Corona;
- Solar Radio Bursts;
- Solar Temperature;
- Brightness Temperature;
- Decimeter Waves;
- Microwave Emission;
- Polarized Electromagnetic Radiation;
- Solar Physics