Observations of Jovian Synchrotron Emission

Details Observations of Jovian Synchrotron Emission Observations of Jovian Synchrotron Emission

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...p52a08b&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #P52A-08 INVITED

Physics

2720 Energetic Particles, Trapped, 2730 Magnetosphere--Inner, 2756 Planetary Magnetospheres (5443, 5737, 6030)

Scientific paper

On route to Saturn, the Cassini spacecraft flew past Jupiter and provided the first opportunity to observe the Jovian synchrotron radiation at a wavelength of 2.2 cm. Measurements were successfully carried out shortly after Jupiter closest approach using the radiometer subsystem of the Cassini Radar Instrument. The resulting data provide unique information on the highest energy electrons in Jupiter's magnetosphere. Earth-based radio telescopes have difficulty measuring the synchrotron radiation at wavelengths this short because of the difficulty in separating atmospheric thermal emission from the synchrotron radiation. The 2.2 cm Cassini radiometer was used to produce 20 maps covering two complete rotations of Jupiter in both horizontal and vertical linear polarization. Synchrotron emission was clearly detected distinct from the thermal emission as evidenced by its polarization and spatial distribution. A ground based campaign involving the VLA (operating at 20 and 90 cm) and the NASA Deep Space Network antennas (operating at 2.3, 8.5, 13.8 and 32 GHz) observed simultaneously with Cassini. The combined data set provides a complete picture of the electron energy spectrum and distribution in the Jovian inner radiation belts. Preliminary results from the observations and modeling efforts will be presented. The JPL contribution to this paper was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

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