Physics
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2373k&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 13, p. 2373-2376
Physics
23
Ionosphere: Current Systems, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Instruments And Techniques
Scientific paper
A simple analytical solution is presented for a minimization problem encountered by Terasawa et al. [1996] in analyzing electromagnetic (EM) field and plasma data series acquired by a spacecraft traversing a one-dimensional (1D) current layer. Their analysis was developed to infer the direction of spatial variation, n, and velocity, un, along n of a 1D EM structure such as the bowshock, the magnetopause, or the geotail current sheet. We show that the optimization procedure of Terasawa et al., which involved a numerical search, in fact reduces to solving a 3×3 eigenproblem for a certain matrix Q defined in terms of the data. A step-by-step outline is given of the operations needed to predict n and un in this manner from an actual data set. Statistical estimates of uncertainty are given. Two magnetopause crossings by the spacecraft AMPTE/IRM are used to illustrate the procedure and to compare the results with those obtained by other methods.
Khrabrov Alexander V.
Sonnerup Bengt U. Ö.
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