Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p54a..04m&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P54A-04
Physics
2720 Energetic Particles, Trapped, 2732 Magnetosphere Interactions With Satellites And Rings, 2740 Magnetospheric Configuration And Dynamics, 2756 Planetary Magnetospheres (5443, 5737, 6030), 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
The Ion and Neutral Camera (INCA), one of three sensors that comprise the Magnetospheric Imaging Instrument (MIMI) on the Cassini/Huygens mission to Saturn and Titan, is designed to operate in one of two modes: either as a high geometry factor ion instrument with high angular resolution, or as an Energetic Neutral Atom (ENA) camera that images the ENA emission from various ion/gas interaction regions in the Saturnian magnetosphere. During Cassini's approach and the first two orbits about Saturn we have begun analyzing INCA data at great distances, where Saturn is an unresolved source. Our emphasis for most of this period is in characterizing variations in the source strength on time scales of hours to weeks (especially looking for periodicities at Saturn's rotation period) and correlating those variations with upstream ion activity as seen in the MIMI ion data, as well as with Saturn Kilometric Radiation as measured by the University of Iowa Radio and Plasma Wave Science instrument. In contrast, during Saturn Orbit Insertion with its traversal of the region inside the radius of Saturn's main rings, INCA had the opportunity to image the interaction between the inner magnetospheric trapped ion population and the inner magnetospheric cold gas population. During the portions of the second Cassini orbit when Cassini returns to within 20 Rs of Saturn, we expect to have additional resolved images of the inner magnetospheric ENA emission region that will add to our knowledge of the spatial distribution of the energetic ions and cold gas inside about 10 Rs, the region that dominates the Saturn output of ENA.
C:son Brandt Pontus
Dandouras Iannis
Gurnett Donald A.
Hamilton Douglas C.
Krimigis Stamatios M.
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