HR: 11:45h
AN: SH42B-06    [Abstracts]
TI: Evidence for Collisionless Magnetic Reconnection at Mars
AU: Brain, D
EM: brain@ssl.berkeley.edu
AF: Space Sciences Laboratory, UC Berkeley, 7 Gauss Way, Berkeley, CA 94720, United States
AU: * Eastwood, J
EM: eastwood@ssl.berkeley.edu
AF: Space Sciences Laboratory, UC Berkeley, 7 Gauss Way, Berkeley, CA 94720, United States
AU: Halekas, J
EM: jazzman@ssl.berkeley.edu
AF: Space Sciences Laboratory, UC Berkeley, 7 Gauss Way, Berkeley, CA 94720, United States
AU: Drake, J
EM: drake@plasma.umd.edu
AF: Space Sciences Laboratory, UC Berkeley, 7 Gauss Way, Berkeley, CA 94720, United States
AU: Drake, J
EM: drake@plasma.umd.edu
AF: Dept. of Physics and Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742, United States
AU: Phan, T
EM: phan@ssl.berkeley.edu
AF: Space Sciences Laboratory, UC Berkeley, 7 Gauss Way, Berkeley, CA 94720, United States
AU: Oieroset, M
EM: oieroset@ssl.berkeley.edu
AF: Space Sciences Laboratory, UC Berkeley, 7 Gauss Way, Berkeley, CA 94720, United States
AU: Mitchell, D
EM: mitchell@ssl.berkeley.edu
AF: Space Sciences Laboratory, UC Berkeley, 7 Gauss Way, Berkeley, CA 94720, United States
AU: Lin, R
EM: boblin@ssl.berkeley.edu
AF: Space Sciences Laboratory, UC Berkeley, 7 Gauss Way, Berkeley, CA 94720, United States
AU: Acuna, M
EM: mario.acuna@nasa.gov
AF: Goddard Space Flight Center, NASA GSFC, Greenbelt, MD 20771, United States
AB: Magnetic reconnection is a fundamental plasma process that enables the rapid conversion of magnetic to particle energy and is important in astrophysics as well as solar, space and planetary physics. Using data from the Mars Global Surveyor (MGS) spacecraft in combination with simulations of reconnection, we present the first direct evidence of collisionless magnetic reconnection at Mars. The evidence indicates that the spacecraft passed through the diffusion region where reconnection is initiated and observed the magnetic field signatures of differential electron and ion motion that uniquely indicate the reconnection process. These are the first such in- situ reconnection observations at an astronomical body other than the Earth. Reconnection may be the source of Mars" recently discovered auroral activity and the changing boundaries of the closed regions of crustal magnetic field.
DE: 2753 Numerical modeling
DE: 6225 Mars
DE: 7835 Magnetic reconnection (2723, 7526)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting