A nightside source of Saturn's kilometric radiation: Evidence for an inner magnetosphere energy driver

Details A nightside source of Saturn's kilometric radiation: Evidence for an inner magnetosphere energy driver A nightside source of Saturn's kilometric radiation: Evidence for an inner magnetosphere energy driver

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3218107f&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 18, CiteID L18107

Physics

10

Planetary Sciences: Fluid Planets: Aurorae, Planetary Sciences: Fluid Planets: Interactions With Particles And Fields, Planetary Sciences: Fluid Planets: Magnetospheres (2756), Planetary Sciences: Fluid Planets: Tori And Exospheres, Planetary Sciences: Solar System Objects: Saturn

Scientific paper

During Cassini's orbit insertion about Saturn, the spacecraft passed within 1.4 Rs of the planet passing from dayside into the nightside region. During this nightside passage, the onboard Radio and Plasma Wave (RPWS) instrument surprisingly detected Saturn kilometric radiation (SKR). Prior to this encounter, it was believed that SKR originated from a high-latitude dayside source, and radio beams from such a source would not be viewable in this nearplanet night-side location. Subsequent analysis presented here reveals that this SKR did indeed originate from the near-midnight region on field lines near L ~ 10-15. Such a radio source suggests the presence of an active region in the night-side inner magnetosphere; this source possibly being near the outer edge of the icy-moon created plasma torus surrounding the planet. The implication is that some of the SKR is driven by an internal energy source that may also account for recent UV aurora observations.

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