Computer Science – Sound
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh53a1263b&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH53A-1263
Computer Science
Sound
7829 Kinetic Waves And Instabilities, 7851 Shock Waves (4455)
Scientific paper
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.
Alleyne H. S.
André Martial
Balikhin Michael A.
Dunlop Malcolm W.
Gedalin M. E.
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