Jovian decametric arcs - an estimate of the required wave normal angles from three-dimensional ray tracing.

Details Jovian decametric arcs - an estimate of the required wave normal angles from three-dimensional ray tracing. Jovian decametric arcs - an estimate of the required wave normal angles from three-dimensional ray tracing.

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9089m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Oct. 1, 1984, p. 9089-9094.

Astronomy and Astrophysics

Astronomy

11

Decametric Waves, Jupiter (Planet), Planetary Radiation, Plasma Jets, Ray Tracing, Arc Discharges, Doppler Effect, Spectrograms, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Jupiter, Decameter Waves, Ray Tracing, Angles, Models, Doppler Effects, Pra, Voyager Missions, Planetary Radio Astronomy Instrument, Source, Frequencies, Parameters, Calculations, Emissions

Scientific paper

Three-dimensional ray tracing is applied to an analysis of variable radio wave normal angle effects on the associated decametric (DAM) arc structures in the Jovian magnetosphere. The analysis is bed on 1-40 MHz radio signature recorded during Voyage 1 and 2 passages. The frequencies considered are above the R-X cut-off, and several ratios of the emission frequency/source frequency. The ray tracing code is based on a cold plasma formula and integration of the Hasselgrove (1955) equations. It is assumed that the emission is in the R-X mode, the source lies at the foot of an Io flux tube, and the emission cone is hollow. Attention is focused on data for two intense, vertex-late, high curvature DAM arc. A possible source for the arcs is found to be doppler-shifted gyroemission from a beam of electrons with an energy of 10 keV. A value of 1.1 is set as the limit of the doppler shift of the DAM emissions.

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