Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.346...87s&link_type=abstract
In ESA, Study of the Solar-Terrestrial System p 87-89 (SEE N93-31674 12-90)
Physics
Earth Magnetosphere, Magnetic Fields, Plasma Oscillations, Plasma Waves, Shock Waves, Spacecraft Motion, Velocity Measurement, Algorithms, Plasma Density, Solar Wind, Temporal Resolution
Scientific paper
A method for estimating the speed of the quasi-perpendicular bow shock from single spacecraft data, based on timing the passage of the shock ramp and of the electron foreshock boundary plus an assumption on the shape of shock surface, is introduced. The Earth's bow shocks respond to changes in the upstream solar wind parameters with rapid motions from one equilibrium position to the next. But the shock also oscillates about its equilibrium position when the wind appears to be steady. Thus, crossings of the bow shock by a spacecraft are more often caused by the shock moving past the observer, with speeds of tens of kilometers per second, than by the spacecraft moving with its orbital speed of approximately 1 km/s past the immobile shock. The shock speed must be known if length scales are to be derived from the appropriate time series of plasma or field parameters and its knowledge is equally important for studies of the dynamical behavior of the shock. The method for estimating the speed of the bow shock is introduced, details are given elsewhere.
Sckopke Norbert
Treumann Rudolf
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