Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm32d..03h&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM32D-03
Physics
2154 Planetary Bow Shocks, 7851 Shock Waves, 7871 Waves And Instabilities
Scientific paper
The terrestrial bowshock is an example of a moderate Mach number collisionless shock which can be studied in detail. Despite decades of study of the quasi-perpendicular shock, several questions remain, such as the scales of various parts of the shock transition and in particular the time and length scales of its variability. Recent measurements using the four Cluster spacecraft make it possible to measure the orientation and motion of the quasi-perpendicular bowshock surface and also, by comparing profiles measured by different spacecraft, its variability. We present estimates of the variation with Mach number of the ramp, overshoot and undershoot scales and compare these with earlier work. We also discuss the variability of shock structures, such as the peak magnetic field and the ramp itself, and demonstrate that the shock ramp varies on scales of a few seconds, but appears to be stable over scales of hundreds of km.
Balogh André
Dandouras Iannis
Horbury Timothy
Lucek Elizabeth
Reme Henri
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