HR: 1340h
AN: SH53A-1263 [Abstracts]
TI: Short Scale Electric Field Turbulence.
AU: * Balikhin, M A
EM: balikhin@acse.sheffield.ac.uk
AF: ACSE, University of Sheffield
Mappin Street, Sheffield, S1 3JD
United Kingdom
AU: Walker, S N
EM: simon.walker@sheffield.ac.uk
AF: ACSE, University of Sheffield
Mappin Street, Sheffield, S1 3JD
United Kingdom
AU: Hobara, Y
SH53A-1263
AF: ACSE, University of Sheffield
Mappin Street, Sheffield, S1 3JD
United Kingdom
AU: Alleyne, H S
EM: h.alleyne@sheffield.ac.uk
AF: ACSE, University of Sheffield
Mappin Street, Sheffield, S1 3JD
United Kingdom
AU: Krasnoseskikh, V V
EM: vkrasnos@cnrs-orleans.fr
AF: LPCE, CNRS, Orleans, cedex 1
France
AU: Gedalin, M E
EM: gedalin@bgumail.bgu.ac.il
AF: Department of Physics, Ben-Gurion University, POBox 653,Israel., Beer-Sheva, 84105
Israel
AU: Andre, M
EM: mats.andre@irfu.se
AF: Swedish Institute of Space Physics, Uppsala Division, P.O. Box 537, Uppsala, SE-751 21
Sweden
AU: Dunlop, M W
EM: m.w.dunlop@rl.ac.uk
AF: Space Sciences Division, Rutherford Appleton Laboratory, Didcot, OX
United Kingdom
AB:
Electric field measurements from a single spacecraft have been used to study ion-sound turbulence observed within the
transition region of a supercritical, quasiperpendicular shock. It is shown that the ion-sound waves observed upstream of the
ramp are convected towards the ramp by the solar wind flow. The observed frequency of the ion-sound waves can be both lower
and higher than the local electron cyclotron frequency depending upon the direction of wave propagation in the plasma rest
frame. The ion-sound waves observed upstream of the ramp can not be generated either by an instability related to the
gradient in the electron temperature or an electric current within the ramp. A comparison of wave vectors for distinctive
wave packets indicate that non-stationary, short scale current layers formed in the processes of the ramp evolution might be
the source of the free energy for such waves.
DE: 7829 Kinetic waves and instabilities
DE: 7851 Shock waves (4455)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: Fall Meeting 2005