Abstract
The results are presented of the high time resolution (0.1 s) observations of solar microwave bursts with the Westerbork synthesis radio telescope. The 10 (rather weak) microwave bursts that are described here were observed at 6 cm wavelength during the Solar Maximum Year (1980) in the Flare Buildup Study (FBS) action periods. The bursts are very different in detailed appearance (e.g., their time evolution, their polarization structure, and the occurrence of strongly polarized spikes and spikes at different positions). There are, however, also interesting similarities. The bursts appear to have a bipolar nature, with the two sources having different characteristics. Often one of the sources is narrow ( 10/sup 8/ K), and highly variable in time. The other source is broader (>15''), fainter (T/sub b/<5 x 10/sup 7/ K), and it shows a more gradual evolution in time. The pattern can be understood as the result of flaring in an asymmetric coronal magnetic arc.
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