On the origin of microwave type U-bursts

A. T. Altyntsev, A. A. Kuznetsov, N. S. Meshalkina, Yan Yihua
2003 Astronomy and Astrophysics  
An analysis is made of the observations of U-type cm-bursts recorded simultaneously with high spatial (Siberian solar radio telescope) and spectral resolution (National Astronomical Observatories/Beijing spectropolarimeters). It is shown that the source positions of increasing and decreasing branches of the U-burst coincide within a few arcsec. The suggestion is made that the occurrence of the observed type U-bursts at microwave frequencies is associated with a pressure and density response to
more » ... ensity response to rapid heating pulses in flare loops.
doi:10.1051/0004-6361:20031273 fatcat:ejgzrqeybfgtljnkoi54gzq6cq