Scattering of interplanetary radio waves at kilometric wavelengths

Details Scattering of interplanetary radio waves at kilometric wavelengths Scattering of interplanetary radio waves at kilometric wavelengths

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1313h&link_type=abstract

Journal of Geophysical Research, Volume 108, Issue A8, pp. SSH 1-1, CiteID 1313, DOI 10.1029/2002JA009783

Physics

Plasma Physics

Radio Science: Radio Wave Propagation, Solar Physics, Astrophysics, And Astronomy: Radio Emissions, Space Plasma Physics: Turbulence, Radio Science: Radio Astronomy

Scientific paper

We report on measurements of the angular size of Jovian radio sources measured by the URAP instrument on the Ulysses spacecraft. The angular size is found to be substantially larger than that expected from the geometric size of the source, which is essentially a point source when viewed from Ulysses. This increase in size is due to scattering of the radio waves caused by fluctuations in the electron density along the path of the radiation. The angular size varies with wavelength as expected for such scattering, and the magnitude of the scattering is in rough agreement with, though less than, results of previous investigations in the slow solar wind. The magnitude of the scattering is found to vary substantially for different radio events, most likely due to changes in the density and/or fluctuation level along the path of the radiation. These measurements are especially suited to determining scattering parameters as the source is point-like and precisely located. Our results confirm that interplanetary scattering imposes important constraints on low-frequency radio observations by new spacecraft missions.

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