Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p11b1260c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P11B-1260
Physics
2756 Planetary Magnetospheres (5443, 5737, 6033), 2764 Plasma Sheet, 2778 Ring Current, 5737 Magnetospheres (2756)
Scientific paper
From the vantage of the dawn sector, the INCA instrument on Cassini imaged neutral hydrogen atoms (20-50 keV) emitted from the center of the Saturn's plasma sheet at a time resolution of one hour for five days during late 2004. Points along the center of the plasma sheet were found from contoured images projected onto the noon-midnight plane; points within 20 RS of Saturn were fitted to straight lines, and the slopes of these lines were examined as a function of time. In the Sun-Saturn-orbit frame, these slopes vary between 17 deg and 25 deg with a well-defined period of 10.80 hours, the same period as that of Saturn kilometric radiation (SKR). This periodic tilting of the plasma sheet is in phase with SKR radiation in the sense that the maximum tilt angle occurs when the maximum in the SKR variation occurs. When fitted to a cosine in SLS3 longitude, the tilt angle periodicity has a phase angle of 47 deg. The periodic tilting of the plasma sheet agrees qualitatively with predictions of the "asymmetric-lift" model of Saturn's magnetosphere and offers direct evidence of a mechanism exciting waves that travel down the magnetotail.
Brandt Patrick
Carbary J.
Krimigis Stamatios
Mitchell Dana D.
Roelof Edmond
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