Simultaneous Observations of Jovian Quasi-periodic Radio Emissions by the Cassini and Galileo Spacecraft

Details Simultaneous Observations of Jovian Quasi-periodic Radio Emissions by the Cassini and Galileo Spacecraft Simultaneous Observations of Jovian Quasi-periodic Radio Emissions by the Cassini and Galileo Spacecraft

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm12b..07h&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM12B-07

Physics

2784 Solar Wind/Magnetosphere Interactions, 5737 Magnetospheres (2756), 6939 Magnetospheric Physics, 6984 Waves In Plasma

Scientific paper

The gravity-assisted flyby by Cassini of Jupiter on December 30, 2000, and the extended Galileo orbital mission provided an opportunity to obtain simultaneous measurements with two spacecraft of the many Jovian plasma wave and radio emissions. One of the emissions detected simultaneously by both spacecraft during this period was the Jovian type III radio emission, also known as Jovian quasi-periodic (QP) emissions. This emission was first detected by Voyager, and has also been observed by the URAP instrument on the Ulysses spacecraft. These bursts usually appear with a periodicity ranging from less then a minute to roughly 60 minutes, and can range from about 1 kHz to above 100 kHz. Inside the Jovian magnetosphere, the QP bursts appear as enhancements in the trapped continuum. Many examples of simultaneous detection of the QP radio emissions were obtained by the Cassini and Galileo plasma wave and radio instruments. These simultaneous observations by the two spacecraft, often separated by many hours in local time and many degrees of system III longitude, suggests a 'strobe light' source for the emission, and not a narrow 'searchlight' type of source rotating with the planet. Similar quasi-periodic events (usually with periods of about 30 to 40 minutes have been detected in the particle data of Ulysses, Galileo and Cassini, in the ultraviolet observations by the UVIS instrument on Cassini, and in the x-ray spectrum obtained by the Chandra spacecraft. The multiple observations of similar quasi-periodic events suggests that there may be a common source for all these observations. However, it has been difficult to find a good correlation between the QP radio events and the other quasi-periodic events. The implications of these simultaneous observations will be discussed.

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