Jovian decameter emissions observed by the Wind/WAVES radioastronomy experiment

Details Jovian decameter emissions observed by the Wind/WAVES radioastronomy experiment Jovian decameter emissions observed by the Wind/WAVES radioastronomy experiment

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...329..776l&link_type=abstract

Astronomy and Astrophysics, v.329, p.776-784 (1998)

Astronomy and Astrophysics

Astrophysics

24

Planets And Satellites: Jupiter, Radio Continuum: Solar System

Scientific paper

The WAVES radio astronomy experiment aboard the Wind spacecraft covers the frequency range from 1 MHz to 13.8 MHz with spectral resolution six times better than that of the Voyager PRA experiment. By combining Wind/WAVES observations with simultaneous observations made by the Nançay Decametric Array (France) between 10 and 40 MHz, the entire frequency spectrum of the jovian decametric emission can be observed. Two representative Io-controlled events (Io-B/D and Io-C) have been selected and analysed in terms of the available models of the jovian environment. In the case of the Io-B/D event at frequencies below 20 MHz, observations and models, to some extent, may fit an emission beam aperture of about 87(deg) . To explain the higher frequencies we must assume that small refraction effects take place near the source region, consistent with topside jovian ionospheric parameters deduced from previous direct measurements. The Io-C event cannot be explained with this simple emission beam geometry: additional effects have to be invoked, as strong propagation effects near caustics or large distortion of the magnetic field in the source.

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