TY  - JOUR
IS  - 24
N1  - Copyright 2005 by the American Geophysical Union
TI  - Ion sound wave packets at the quasiperpendicular shock front
AV  - public
VL  - 32
Y1  - 2005/12/28/
JF  - Geophysical Research Letters
A1  - Balikhin, M
A1  - Walker, S
A1  - Treumann, R
A1  - Alleyne, H
A1  - Krasnoselskikh, V
A1  - Gedalin, M
A1  - Andre, M
A1  - Dunlop, M
A1  - Fazakerley, A
N2  - Electric field measurements from a single spacecraft have been used to study ion-sound turbulence observed within the Earth's bow shock. 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.
ID  - discovery162799
UR  - http://dx.doi.org/10.1029/2005GL024660
PB  - American Geophysical Union
SN  - 0094-8276
ER  -