HR: 1340h
AN: SA13A-1118    [Abstracts]
TI: Structure of the Martian Wake
AU: * Fedorov, A
EM: Andrei.Fedorov@cesr.fr
AF: Centre d'Etude Spatiale des Rayonnements, 9, avenue du Colonel ROCHE, TOULOUSE, 31028 France
AU: Budnik, E
EM: Elena.Budnik@cesr.fr
AF: Centre d'Etude Spatiale des Rayonnements, 9, avenue du Colonel ROCHE, TOULOUSE, 31028 France
AU: Barabash, S
EM: stas@irf.se
AF: Swedish Institute of Space Physics, Box 812, Kiruna, S-981 28 Sweden
AU: Lundin, R
EM: rickard@irf.se
AF: Swedish Institute of Space Physics, Box 812, Kiruna, S-981 28 Sweden
AU: Winningham, D
EM: david@cluster.space.swri.edu
AF: Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78228 United States
AU: Acuna, M
EM: Mario.H.Acuna@nasa.gov
AF: Goddard Space Flight Center, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AB: The first results from the ion mass analyzer IMA of the ASPREA-3 instrument on-board of the Mars Express spacecraft show that the martian wake consists of two different ion regimes. In the first regime ions of planetary origin form the layer adjacent to the magnetic pile-up boundary. These ions are accelerated to relatively high energies and exhibit a gradual decreasing of energy down to the planetary tail. The second plasma regime is observed in the planetary shadow. The heavy ion are accelerated to the energy of the solar wind protons. Obviously the acceleration mechanism is different for the different plasma regimes. Study of two plasma regimes in the frame referred to interplanetary magnetic field (IMF) direction (we used MGS magnetometer data to obtain the IMF orientation) clearly shows their spatial anisotropy. The monoenergetic plasma in the planetary shadow is observed only in the narrow angular sector around the positive direction of the interplanetary electric field.
DE: 6225 Mars
DE: 2152 Pickup ions
DE: 2756 Planetary magnetospheres (5443, 5737, 6030)
DE: 2780 Solar wind interactions with unmagnetized bodies
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting