The determination of shock ramp width using the noncoplanar magnetic field component

Details The determination of shock ramp width using the noncoplanar magnetic field component The determination of shock ramp width using the noncoplanar magnetic field component

1997-02-09

arxiv.org/abs/physics/9702009v1

Physics

Space Physics

6 pages, LaTeX (aguplus + agutex); packages:amsmath,times,graphicx,float, psfrag,verbatim; 3 postscript figures called by th

Scientific paper

We determine a simple expression for the ramp width of a collisionless fast shock, based upon the relationship between the noncoplanar and main magnetic field components. By comparing this predicted width with that measured during an observation of a shock, the shock velocity can be determined from a single spacecraft. For a range of low-Mach, low-beta bow shock observations made by the ISEE-1 and -2 spacecraft, ramp widths determined from two-spacecraft comparison and from this noncoplanar component relationship agree within 30%. When two-spacecraft measurements are not available or are inefficient, this technique provides a reasonable estimation of scale size for low-Mach shocks.

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