Abstract
It is shown that the character of the spatial directivity of solar radio
bursts is determined by the
frequency of the spectral maximum. This is explained by differences in
the locations of the sources
and the orientation of the corresponding magnetic fields. Specifically,
'low-frequency' 3-5 GHz
bursts of a magnetobremsstrahlung nature are generated in
quasi-tangential fields near magnetic
loop apexes while 'high-frequency' 9-15 GHz bursts are generated in the
stronger quasi-radial
field at loop bases.