Time-varying magnetospheric environment near Enceladus as seen by the Cassini magnetometer

Details Time-varying magnetospheric environment near Enceladus as seen by the Cassini magnetometer Time-varying magnetospheric environment near Enceladus as seen by the Cassini magnetometer

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3709203j&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 9, CiteID L09203

Physics

Plasma Physics

7

Planetary Sciences: Solar System Objects: Saturnian Satellites, Magnetospheric Physics: Magnetosphere Interactions With Satellites And Rings, Planetary Sciences: Solid Surface Planets: Interactions With Particles And Fields, Planetary Sciences: Comets And Small Bodies: Atmospheres (1060), Space Plasma Physics: Charged Particle Motion And Acceleration

Scientific paper

In 2008, the Cassini spacecraft made four close Enceladus flybys along similar trajectories. During these flybys the magnetometer recorded the time-varying magnetic field associated with the plasma interaction with Enceladus and its plume. Close to Enceladus, the Cassini magnetometer observed 4% to 7% enhancement in the magnetic field magnitude, associated with the slowing down of the ambient plasma. Herein we examine these four flybys, estimate the deceleration of the flow, locate the momentum-loading center for each pass, and compare their pass to pass variability. Even though the spacecraft trajectories were similar, two different types of perturbations were observed at distances greater than 5 Enceladus radii downstream, and to the north of the moon. Ion-cyclotron waves were observed during each of the flybys, with pass to pass wave amplitudes varying in a similar manner as the enhancement of the field magnitude.

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