HR: 15:10h
AN: NG33A-07    [Abstracts]
TI: Electrostatic Solitary Waves in the vicinity of the Terrestrial Bow Shock
AU: * Hobara, Y
EM: y.hobara@sheffield.ac.uk
AF: Department of Automatic Control and Systems Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom
AU: Walker, S N
EM: simon.walker@sheffield.ac.uk
AF: Department of Automatic Control and Systems Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom
AU: Balikhin, M
EM: m.balikhin@sheffield.ac.uk
AF: Department of Automatic Control and Systems Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom
AU: Gedalin, M
EM: gedalin@bgumail.bgu.ac.uk
AF: Department of Physics, Ben-Gurion University, Beer-Sheva, Beer-Sheva, 84105, Israel
AU: Krasnoselskikh, V
EM: vkrasnos@cnrs-orleans.fr
AF: LPCE/CNRS, 3A Avenue de la Recherche Scientifique, Orléans, 45071, France
AU: Hayakawa, M
EM: hayakawa@whistler.ee.uec.ac.jp
AF: Department of Electronic Engineering, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, 182-8585, Japan
AU: Andre, M
EM: mats.andre@irfu.se
AF: Swedish Institute of Space Physics, Box 537, Uppsala, SE-751 21, Sweden
AU: Dunlop, M
EM: m.w.dunlop@rl.ac.uk
AF: Space Science Division, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, United Kingdom
AU: Reme, H
EM: henri.reme@cesr.cnes.fr
AF: CESR/CNRS, 9, avenue du Colonel Roche, Toulouse, 31028, France
AU: Fazakerley, A
EM: anf@mssl.ucl.ac.uk
AF: MSSL, University College London, Holmbury St. Mary, Dorking, Surry, RH5 6NT, United Kingdom
AB: Nonlinear, small scale electric field structures are recognized as an ubiquitous phenomenon in space plasma. However, their role in the processes of energy, momentum, and charge redistribution is still unclear. Using Cluster EFW data we analyze a number of instances of uni/bi/tri-polar electrostatic solitary waves observed in the weakly magnetized foot region of a quasi-perpendicular shock to investigate their fundamental wave properties, generation mechanisms, significance in the plasma dynamics and their contribution to the overall of shock structure. The properties of the solitary waves (e.g., wave propagation direction, velocity, potential scale and amplitude) are experimentally derived by means of the phase-differencing method applied to two sets of parallel electric field components. The observed solitary waves are found to correspond to ion depletion structures such as BGK ion holes. The derived wave properties are compared with the predictions from analytical theory and numerical computations to study their excitation mechanisms. These parameters are also compared with observations from other space plasma regions to study the parametric dependence of solitary waves in different plasma regimes.
DE: 2154 Planetary bow shocks
DE: 4455 Nonlinear waves, shock waves, solitons (0689, 2487, 3280, 3285, 4275, 6934, 7851, 7852)
DE: 7800 SPACE PLASMA PHYSICS
DE: 7815 Electrostatic structures
DE: 7852 Solitons and solitary waves (4455)
SC: Nonlinear Geophysics [NG]
MN: 2007 Fall Meeting