HR: 0800h
AN: P41B-03    [Abstracts]
TI: New Horizons at Jupiter: Energetic Particle Observations from PEPSSI
AU: McNutt, R L
AF: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, United States
AU: * Hill, M E
EM: matt.hill@jhuapl.edu
AF: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, United States
AU: Gurnee, R S
AF: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, United States
AU: Haggerty, D K
AF: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, United States
AU: Ho, G C
AF: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, United States
AU: Krimigis, S M
AF: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, United States
AU: Krimigis, S M
AF: Academy of Athens, Academy of Athens, Athens, Greece
AU: Livi, S
AF: Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78228-0510, United States
AU: Mauk, B H
AF: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, United States
AU: Mitchell, D G
AF: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, United States
AB: The Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) instrument on the New Horizons spacecraft began making energetic particle measurements ~1000 Jovian radii ({R}_J) upstream of Jupiter beginning in January 2007. Measurements are set to continue through May 2007 when the spacecraft will be ~2000 {R}_J downstream of Jupiter. Following its gravity assist en route to Pluto, New Horizon's trajectory remains very near the Sun-Jupiter line, spending the first 40 days after closest approach (~32 {R}_J, 28 February) within 100 {R}_J of the Sun-Jupiter line and remaining within 300 {R}_J through May. This trajectory provides the best opportunity for continuous Jovian magnetotail measurements to date. PEPSSI is a time-of-flight and energy spectrometer with angular coverage in a 25°x160° swath in six angular sectors. The instrument covers ions and electrons within the ~10 to 1000 keV range. A series of upstream events associated with interplanetary activity were measured prior to entry into the Jovian magnetosphere. Increased fluxes of energetic ions and electrons were detected near 70 {R}_J, consistent with an inbound crossing of the magnetopause and consistent with similar observations at Jupiter by Voyager 1 and Voyager 2. Preliminary analysis reveals distinct signatures of H, He, O, and S ions, as well as of electrons, and shows highly structured temporal variations. We report on these first results from the PEPSSI instrument during its approach to, and recession from, Jupiter
DE: 2114 Energetic particles (7514)
DE: 2154 Planetary bow shocks
DE: 2744 Magnetotail
DE: 6220 Jupiter
SC: Planetary Sciences [P]
MN: 2007 Joint Assembly