Occurrence statistics and ray tracing study of Jovian quasiperiodic radio bursts observed from low latitudes

Details Occurrence statistics and ray tracing study of Jovian quasiperiodic radio bursts observed from low latitudes Occurrence statistics and ray tracing study of Jovian quasiperiodic radio bursts observed from low latitudes

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11505217k&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A5, CiteID A05217

Astronomy and Astrophysics

Astrophysics

2

Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Solar Physics, Astrophysics, And Astronomy: Radio Emissions, Radio Science: Radio Astronomy, Radio Science: Radio Wave Propagation, Planetary Sciences: Fluid Planets: Magnetospheres (2756)

Scientific paper

The occurrence characteristics of Jovian quasiperiodic (QP) bursts at a VLF range (<10 kHz) were statistically investigated using data from the Galileo spacecraft at low latitudes in the Jovian magnetosphere. The results confirmed that the occurrence of QP bursts is significantly dependent on the phase of planetary rotation rather than the central meridian longitude of the observer seen from Jupiter. It was revealed that the meridional distribution of QP bursts forms a shadow zone in the equatorial region of <30 Jovian radii from Jupiter, similar to that of hectometric radio emissions, where QP bursts are quenched. Based on the ray tracing method, we surveyed the source parameters, which can reproduce the observed shadow zone. It was suggested that the wave mode, source location, and directivity of the radio emissions are as follows: the extraordinary mode is reasonable for QP bursts observed at low latitudes, the source is located around an altitude of ˜10-20 Jovian radii above the polar region, the L value of the source field line is in a range of L > ˜20, and QP bursts could have beaming angles like “filled cone” in a restricted L value range or have a large source L value range with beaming angles like “hollow cones.” These results imply that QP bursts observed at low latitudes are generated at fRX surfaces in the polar region and propagate to the equatorial region.

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