The magnetopause transition: Cluster observations

Details The magnetopause transition: Cluster observations The magnetopause transition: Cluster observations

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm51b0532d&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM51B-0532

Physics

2724 Magnetopause, Cusp, And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics, 2794 Instruments And Techniques

Scientific paper

The transition parameter (TP, Hapgood and Bryant, 1992), for the magnetopause to magnetosheath traversal, reveals an underlying order to magnetopause structure which is not readily seen in time series data because of rapid boundary motion (temporal, as opposed to spatial, effects are better revealed in this re-ordering). The ordering works irrespective of the presence of accelerated flows, wave motions or FTE signatures, but it is not known how the TP is related to spatial boundary-normal distance. Previous application of the TP to AMPTE-UKS and -IRM data identified the total LLBL thickness to be of order 1500 km. The form of the TP variation in boundary aligned co-ordinates (and specifically with normal distance) is likely to be different in each case, however. Since knowledge of boundary orientation, thickness and motion can independently scale the plasma and field signatures across the boundary layer, the four point Cluster data allow us to compare the TP ordering in the context of well defined boundary behaviour and also allows us to look at the effects of reconnection site motions. We investigate a number of magnetopause crossings observed by Cluster on different spatial scales.

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