HR: 16:42h
AN: SM44A-04    [Abstracts]
TI: Velocity Dispersion and Spatial Structures in the Jovian Magnetotail
AU: * Hill, M E
EM: matt.hill@jhuapl.edu
AF: Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, United States
AU: Haggerty, D K
AF: Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, United States
AU: McNutt, R L
AF: Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, United States
AB: The unique trajectory of the New Horizons spacecraft almost directly down the center of Jupiter's magnetotail allowed continuous energetic particle and plasma measurements to 2600 Jovian radii (R_J)---over 15 times further than any other spacecraft. The Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) instrument during this period detected clear evidence of at least eight instances of velocity dispersion of 30 keV--1 MeV ions from 880 to 1950 R_J down the tail. This is consistent with what would occur if all particle energies were simultaneously injected and allowed to propagate. One such event, beginning on day 118 of 2007 at 1350 R_J and lasting just over a day, showed superposed spatial and temporal structure, with dispersive signatures abruptly cutoff and new signatures appearing, apparently as the spacecraft moved back and forth between three separate regions. These regions appear to be well connected to a common injection site but are dominated by distinct dispersive events with onsets separated by hours. We will report on the dispersion events in the PEPSSI data, and, in the case of the day 118 event, estimate the size and motion of the spatial structures.
DE: 2716 Energetic particles: precipitating
DE: 2744 Magnetotail
DE: 6220 Jupiter
DE: 7845 Particle acceleration
DE: 7859 Transport processes
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting