The formation of arcs in the dynamic spectra of Jovian decameter bursts

Details The formation of arcs in the dynamic spectra of Jovian decameter bursts The formation of arcs in the dynamic spectra of Jovian decameter bursts

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8569g&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 30, 1981, p. 8569-8578.

Astronomy and Astrophysics

Astronomy

40

Decametric Waves, Jupiter (Planet), Planetary Radiation, Radio Astronomy, Radio Spectra, Arcs, Electron Density (Concentration), Frequency Response, Voyager Project, Jupiter, Decameter Waves, Bursts, Dynamics, Spectrum, Arcs, Formation, Models, Features, Wavelengths, Pra, Planetary Radio Astronomy Experiment, Voyager 1, Voyager 2, Refraction, Waves, Magnetic Fields, Plasmas, Data, Density, Radiation, Frequencies, Altitude, Gradients, Patterns, Shape, Comparisons, Plasma Sheets, Electrons, Source Medium

Scientific paper

A model is presented that accounts for several features of the dynamic spectral arcs observed at decameter wavelengths by the planetary radio astronomy experiment on Voyagers 1 and 2. It is shown that refraction of an extraordinary mode wave initially excited and nearly orthogonal to the local magnetic field is significantly influenced by the local plasma density. The source of the radiation is on the L = 6 flux, and the emission cone angle of the sheet is chosen to vary with frequency so that it is relatively small at both high and low frequencies while about 80 deg at intermediate frequencies. This functional dependence of cone angle on frequency appears to be consistent with estimates of refraction of the ordinary mode in a source region where the electron density is greater than a few hundred per cu cm.

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