Microwave observation of rapid propagation of a non-thermal sources in a solar flare by Nobeyama Radioheligoraph
Abstract
We report a Nobeyama Radioheliograph (NoRH) microwave observation of a propagating feature of non-thermal emission in a solar flare on August 28, 1999 with GOES soft X-ray class M2.8. The flare had a very extended source ( 105 km) well resolved by the NoRH, which is confirmed to be a magnetic loop by comparing with the photospheric magnetic field. In the rising phase of the microwave burst, a non-thermal gyrosynchrotron source was observed by the high-rate (10 images per second) observation of the NoRH to propagate from one end of the loop to the other with a speed of 104 km s-1 . It is a first observation of such a rapid propagating non-thermal microwave source inside a flaring loop. We also found a nearly 105 km s-1 propagation in the same apparent position. This is the first imaging observation of streaming electrons.
- Publication:
-
34th COSPAR Scientific Assembly
- Pub Date:
- 2002
- Bibcode:
- 2002cosp...34E2325Y