Does Dione have a tenuous atmosphere?

Details Does Dione have a tenuous atmosphere? Does Dione have a tenuous atmosphere?

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusm.p43a..03k&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #P43A-03

Physics

2732 Magnetosphere Interactions With Satellites And Rings, 6280 Saturnian Satellites

Scientific paper

Magnetic field observations collected from a close flyby of Dione by the Cassini spacecraft provide hints of a plasma-loading type interaction. The magnetic field lines drape around the moon and have a higher field strength upstream of the moon. Detailed modeling shows that this moon is a net contributor to the plasma in its vicinity. Even though the inferred mass-loading rates are quite small (< 7 gm/s), a detailed investigation shows that they cannot be explained from sputtering from the surface alone. The observations from Dione are in contrast to observations from Tethys and Rhea where the moons appear to absorb all the plasma incident upon them such that the wakes of these moons were observed to have enhanced field strengths and the magnetic field appeared to be drawn into the wakes from the flanks. The strength of ion-cyclotron waves observed in Saturn's magnetosphere also show an enhancement close to Dione's position indicating that the moon is a source of newly ionized plasma.

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