HR: 16:30h
AN: SM44A-03    [Abstracts]
TI: Characteristics of low energy ions observed by New Horizon/SWAP during Jupiter's mangetotail flyby
AU: * Su, Y
EM: yijiun@uta.edu
AF: University of Texas at Arlington, Physics Department, 502 Yates St., Science Hall 108, Box 19059, Arlington, TX 76019, United States
AU: Bagenal, F
EM: bagenal@lasp.colorado.edu
AF: University of Colorado, Astrophysical and Planetary Science Department, UCB 391, Boulder, CO 80309, United States
AU: McComas, D J
EM: DMcComas@swri.edu
AF: Southwest Research Institute, Space Science and Engineering, P.O. Drawer 28510, San Antonio, TX 78228, United States
AU: Elliott, H A
EM: helliott@swri.edu
AF: Southwest Research Institute, Space Science and Engineering, P.O. Drawer 28510, San Antonio, TX 78228, United States
AU: Crary, F J
EM: Fcrary@swri.edu
AF: Southwest Research Institute, Space Science and Engineering, P.O. Drawer 28510, San Antonio, TX 78228, United States
AB: On February 28, 2007, the New Horizon (NH) spacecraft began traversing a path nearly straight down Jupiter's enormous magnetotail. Beginning on DOY 82 and throughout the period of time in which NH remained in the tail region, the spacecraft was spinning at a rate of 5 rotations per minute (RPM) with its high-gain antenna pointing toward Earth. A "herringbone" pattern of low energy ions was observed by the Solar Wind Around Pluto (SWAP) instrument once NH was spinning [McComas et al., 2007]. SWAP was designed to make coincidence measurements of ions from 35 eV/q to 7.5 keV/q with a 276° × 10° field-of-view. With calibration parameters provided by the SWAP instrument team, we are able to estimate the ion characteristics by constructing observed signatures from a 3D phase-space density model. Densities and speeds in the inner magnetosphere (< 100 R_J) were obtained to be consistent with previous missions. The dominant velocity component of plasmas is in the tailward direction. The observed ion thermal speeds are relatively low when compared to the bulk velocities indicating that Jupiter's magnetotail is filled with high Mach number plasmas. Low-energy ion moments (density, three components of velocity, and temperature) of selected periods from NH/SWAP will be presented for the first time during the flyby of Jupiter's magnetotail. McComas, D. J., F. Allegrini, F. Bagenal, F. Crary, R. W. Ebert, H. Elliott, A. Stern, and P. Valek, Jupiter's Magnetotail: Diverse Plasma Populations and Structures, Science, submitted, 2007.
DE: 2744 Magnetotail
DE: 2756 Planetary magnetospheres (5443, 5737, 6033)
DE: 5443 Magnetospheres (2756)
DE: 5737 Magnetospheres (2756)
DE: 6033 Magnetospheres (2756)
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting