HR: 12:09h
AN: SM22A-07    [Abstracts]
TI: Substorns without Dayside Reconnection: Lessons from the Outer Planets
AU: Ge, Y S
EM: yasong@igpp.ucla.edu
AF: Institute of Geophysics, University of California 405 Hilgard Ave, Los Angeles, Ca 90095, United States
AU: * Russell, C T
EM: ctrussell@igpp.ucla.edu
AF: Institute of Geophysics, University of California 405 Hilgard Ave, Los Angeles, Ca 90095, United States
AU: Jian, L
EM: jlan@igpp.ucla.edu
AF: Institute of Geophysics, University of California 405 Hilgard Ave, Los Angeles, Ca 90095, United States
AU: Dougherty, M K
EM: m.dougherty@imperial.ac.uk
AF: Imperial College, The Blackett Lab Imperial College, The Blackett Lab, Dept of Physics, London, SW7 2BZ, United Kingdom
AU: Jackman, C M
EM: c.jackman@imperial.ac.uk
AF: Imperial College, The Blackett Lab Imperial College, The Blackett Lab, Dept of Physics, London, SW7 2BZ, United Kingdom
AB: The fundamental attribute of the Near-Earth neutral line model is the accumulation of stored magnetic energy in the tail during a growth phase, and the sudden release of that energy during an expansion phase, followed by a recovery. The existence of substorms at both Jupiter and Saturn enables us to explore this model under varied boundary conditions. In particular the source of plasma convection is quite different at Earth, Jupiter and Saturn, being clearly solar-wind driven at Earth, internally driven at Jupiter, and under debate at Saturn. We use observations of the magnetotails of Jupiter and Saturn to show that analogous processes occur therein with both similarities to and differences with Earth. The rate of tail reconnection appears to be faster at Jupiter and Saturn, producing very strong north-south field, and the growth phases appear to be much longer. Despite the expected weakness of dayside reconnection with the interplanetary magnetic field, plasmoids are formed in the tail and the tail field strength increases and decreases as seen at Earth.
DE: 2723 Magnetic reconnection (7526, 7835)
DE: 2744 Magnetotail
DE: 2790 Substorms
DE: 6220 Jupiter
DE: 6275 Saturn
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Joint Assembly