Interferometric Studies of Type IV Solar Bursts of Continuum Radiation on 340 and 87 Mc/s.
Abstract
Interferometric observations made on 340 and 87 Mc/s show the following properties of Type IV continuum bursts: (1) Type IV emission on 340 Mc/s occurs at a height of less than 40000 km in the solar atmosphere. Its source has a small angular diameter (usually less than 4'), and it shows practically no motion within +2 minutes of arc. (2) Type IV emission on 87 Mc/s occurs high in the corona (more than 200000 km above the photosphere). Its source has a large angular diameter (of the order of 10' or larger) and a large movement. These distinctive properties of Type IV emission as observed on 340 and 87 Mc/s support the suggestion that Type IV emission occurs in two distinct phases-one characteristic of centimeter-wave continuum emission extending up to frequencies as low as 250 Mc/s, and the other, characteristic of meter-wave continuum emission occurring at frequencies lower than about 250 Mc/s.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1961
- DOI:
- 10.1086/147166
- Bibcode:
- 1961ApJ...134..389K