Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...576l..87y&link_type=abstract
The Astrophysical Journal, Volume 576, Issue 1, pp. L87-L90.
Astronomy and Astrophysics
Astronomy
25
Acceleration Of Particles, Sun: Flares, Sun: Radio Radiation
Scientific paper
We report a Nobeyama Radioheliograph (NoRH) microwave observation of propagating features of nonthermal emission in a solar flare on 1999 August 28, an M2.8 event for the GOES soft X-ray class. The flare had a very extended source (~4.5×104 km) that was well resolved by the NoRH, and it is confirmed to be a magnetic loop by comparison with the photospheric magnetic field. In the rising phase of the microwave burst, a nonthermal 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 6×103 km s-1. We also found a 9×104 km s-1 propagation in the same apparent position, which is the first imaging observation of streaming electrons.
Melnikov Victor F.
Nakajima Hiroaki
Shibasaki Kazuo
Stepanov Alexander V.
Yokoyama Tadashi
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