Upper Bound on Interplanetary Radio Scattering Using Jovian NKOM Radiation

Details Upper Bound on Interplanetary Radio Scattering Using Jovian NKOM Radiation Upper Bound on Interplanetary Radio Scattering Using Jovian NKOM Radiation

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh21c..04h&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH21C-04

Physics

7534 Radio Emissions, 7871 Waves And Instabilities, 2100 Interplanetary Physics, 2149 Mhd Waves And Turbulence, 2159 Plasma Waves And Turbulence

Scientific paper

Radio waves propagating in the interplanetary medium are scattered by density inhomogeneties that produce variations in the refractive index. This scattering produces an increase of the apparent angular size of a radio source beyond its inherent geometrical size. Since all radio sources are subject to this effect, it sets a limit on how well the size of a radio source can be known, and to a lesser extent, its direction as well. The Unified Radio and Plasma instrument (URAP) on the Ulysses spacecraft has the ability to determine the apparent angular size of a radio source, and we have applied this capability to Jovian narrow band kilometric radiation (NKOM) observed by Ulysses after its encounter with Jupiter in March 1992. NKOM events were observed by Ulysses into 1993 when Ulysses was at a distance of 2.5 AU or more from Jupiter. Analysis of these events using the radio direction-finding techniques of URAP have yielded angular source sizes of approximately 10 degrees or less. Since the URAP instrument, when in the mode that sums the signals on the X and Z antennas, measures the angular size with an error of about this magnitude, these results effectively yield an upper limit on the amount of scattering that is occurring in the interplanetary medium. We will present the latest results of these measurements and relate them to theoretical analysis of the scattering due to the statistical properties of random density fluctuations.

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