On the origin of microwave type U-bursts
Institute of Solar-Terrestrial Physics, Siberian Branch of the Russian Academy of Sciences (ISTP SB RAS), PO Box 4026, Irkutsk 33, 664033, Russia e-mail: firstname.lastname@example.org
2 National Astronomical Observatories, Chinese Academy of Sciences, Datun Road A20, Chaoyang District, Beijing 100012, PR China e-mail: email@example.com
Corresponding author: N. S. Meshalkina, firstname.lastname@example.org
Accepted: 1 August 2003
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 rapid heating pulses in flare loops.
Key words: Sun: flares / Sun: activity / Sun: radio radiation
© ESO, 2003