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Preliminary results on the apparent size of the sources of type III bursts observed at low frequencies
Authors:Hector Alvarez
Institution:(1) Radio Astronomy Observatory, The University of Michigan, Ann Arbor, Mich., U.S.A.;(2) Present address: Centro de Investigación de Astronomía, Apartado 264, Mérida, Venezuela
Abstract:We present preliminary results on the apparent angular size of the sources of four type III bursts observed between 3500 and 50 kHz from the IMP-6 spacecraft. The observations were made with a dipole rotating in the plane of the ecliptic where the sources are assumed to be. The apparent angular sizes obtained are unexpectedly large. We discuss different explanations for the results. It seems that the scattering of radio waves by electron density inhomogeneities is the most likely cause.We report a temporal increase of the apparent angular size of the source during the burst lifetime for some bursts. From its characteristics it apears to be a real effect.
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