Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..477l&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 8, July-Aug. 1990, p. 477-487. Research supported by the Oesterreichische Akademie de
Astronomy and Astrophysics
Astronomy
18
Astronomical Models, Jupiter (Planet), Planetary Radiation, Radio Astronomy, Radio Waves, Electron Density (Concentration), Io, Magnetic Fields, Polarization (Waves), Voyager 1 Spacecraft, Voyager 2 Spacecraft
Scientific paper
To model the Jovian hectometric radiation (HOM), three-dimensional ray-tracing was performed at a frequency of f = 500 kHz. The source locations are assumed to lie along magnetic field lines L = 20 as determined by Ladreiter and Leblanc (1990). Furthermore, they are distributed uniformly in longitude at magnetospheric heights, where the cyclotron frequency is less than but nearly equal to the wave frequency. The emission is beamed at large angles (70-80 deg) with respect to the magnetic field and propagates in the extraordinary (R-X) mode. this result accounts for the major characteristics of the HOM radiation as observed by the Planetary Radio Astronomy (PRA) experiment aboard Voyager 1 and Voyager 2 during the encounter period and at large distances from the planet. The modeled radiation pattern reveals the existence of a shadow zone at the magnetic (dipole) equatorial plane extending to about 20 Jovian radii which was actually observed by both Voyagers.
Ladreiter Hans Peter
Leblanc Yolande
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