| Issue |
A&A
Volume 411, Number 2, November IV 2003
|
|
|---|---|---|
| Page(s) | 263 - 271 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361:20031273 | |
| Published online | 17 November 2003 | |
On the origin of microwave type U-bursts
1
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: altyntsev@iszf.irk.ru
2
National Astronomical Observatories, Chinese Academy of Sciences, Datun Road A20, Chaoyang District, Beijing 100012, PR China e-mail: yyh@bao.ac.cn
Corresponding author: N. S. Meshalkina, nata@iszf.irk.ru
Received:
8
April
2003
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
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