Magnetopause reconnection impact parameters from multiple spacecraft magnetic field measurements

Details Magnetopause reconnection impact parameters from multiple spacecraft magnetic field measurements Magnetopause reconnection impact parameters from multiple spacecraft magnetic field measurements

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3620108w&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 20, CiteID L20108

Physics

Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Magnetic Reconnection (7526, 7835), Magnetospheric Physics: Cusp

Scientific paper

We present a novel technique that exploits multiple spacecraft data to determine the impact parameters of the most general form of magnetic reconnection at the magnetopause. The method consists of a superposed epoch of multiple spacecraft magnetometer measurements that yields the instantaneous magnetic spatial gradients near a magnetopause reconnection site. The gradients establish the instantaneous positions of the spacecraft relative to the reconnection site. The analysis is well suited to evaluating the spatial scales of singular field line reconnection, which is characterized by a two-dimensional x-type topology adjacent and perpendicular to a reconnecting singular field line. Application of the method to Cluster data known to lie in the vicinity of a northward IMF reconnection site establishes a field topology consistent with singular field line reconnection and a normal magnetic field component of 20 nT. The corresponding current structure consists of a 130 km sheet possibly embedding a thinner, bifurcated sheet.

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