Finite Gyro-Radius Ion Pickup Current at Titan: Application to T9 and T5

Details Finite Gyro-Radius Ion Pickup Current at Titan: Application to T9 and T5 Finite Gyro-Radius Ion Pickup Current at Titan: Application to T9 and T5

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5608s&link_type=abstract

American Astronomical Society, DPS meeting #39, #56.08; Bulletin of the American Astronomical Society, Vol. 39, p.530

Astronomy and Astrophysics

Astronomy

Scientific paper

We propose a possible explanation for the second wake event observed by Cassini during the T9 encounter with Titan. As shown in Hartle and Sittler [2007a], ions will emanate from Titan's upper atmosphere as ion beams when the ion gyroradii are large compared to the neutral scale height. Furthermore, Sittler and Hartle [2007] and Hartle and Sittler [2007b] showed that when this condition is satisfied and the electric field of the external flow is not reduced significantly due to draping field lines, the heavier pickup ions will be highly localized in space and velocity, or beam-like, in Titan's wake. This can cause these ion bunches to jump across the spacecraft trajectory and not be observed except for the lighter ions such as H+ and H2+, which have smaller gyroradii. These heavy ions will form a large pickup current which can deflect the tail position away from Saturn. We will discuss this model for the T9 encounter, which was a wake pass, and also explore its possible application for T5.
Hartle, R. E. and E. C. Sittler Jr., J. Geophys. Res., vol. 112, A07104, 2007a.
Sittler, E. C., Jr. and R. E. Hartle, P44A-08, Joint 2007 Meeting in Acapulco, Mexico, May 22-25, 2007.
Hartle, R. E. and E. C. Sittler Jr., Joint 2007 IUGG/IAGA meeting in Perugia, Italy, July 2-13, 2007b.

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