Radio and Plasma Wave Observations From the Cassini and Galileo Spacecraft During the Cassini Flyby of Jupiter

Details Radio and Plasma Wave Observations From the Cassini and Galileo Spacecraft During the Cassini Flyby of Jupiter Radio and Plasma Wave Observations From the Cassini and Galileo Spacecraft During the Cassini Flyby of Jupiter

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...p52a04g&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #P52A-04 INVITED

Other

2724 Magnetopause, Cusp, And Boundary Layers, 2772 Plasma Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

During the Cassini flyby of Jupiter, which occurred on December 30, 2000, simultaneous data were collected from the Galileo spacecraft, which is in orbit around Jupiter, and from the Cassini spacecraft. In this paper we report results from the Radio and Plasma Wave Science (RPWS) instrument on the Cassini spacecraft and from the Plasma Wave Science (PWS) instrument on the Galileo spacecraft. During the approximately one-month period that the Cassini spacecraft was within 200 RJ of Jupiter, a total of 8 bow shocks and 4 magnetopause crossings were detected with the Cassini RPWS. The shocks were easily identified by the strong broadband burst of electrostatic noise and the upstream electron plasma oscillations that are usually associated with planetary bow shocks. The magnetopause crossings were identified by the onset of strong continuum radiation trapped in the low-density magnetospheric cavity. These bow shock and magnetopause crossings are compared with a series of similar crossings detected by the Galileo PWS. Two of the magnetopause crossings are of particular interest, since they occurred nearly simultaneously (within one hour) at two widely separated locations on the dusk flank of the magnetosphere. These crossings provide important new constraints on the shape and variability of the Jovian bow shock and magnetopause. In addition to the bow shock and magnetopause crossings, the RPWS and PWS also provided simultaneous observations of a variety of Jovian radio emissions at widely separated locations in the vicinity of Jupiter. These observations provide an unprecedented opportunity to study the beaming and temporal evolution of Jovian radio emissions. For example, during an unusually strong narrow-band kilometric (nKOM) radio emission event, the beam of radiation can be seen sweeping sequentially over the Cassini and Galileo spacecraft in synchronism with Jupiter's rotation. These, and other similar observations often show significant spectral differences at the two spacecraft, indicating that the radiation beam is either highly structured or evolving in time.

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