Simultaneous Two-Altitude Measurements of High Latitude Magnetosphere-Ionosphere Coupling

Details Simultaneous Two-Altitude Measurements of High Latitude Magnetosphere-Ionosphere Coupling Simultaneous Two-Altitude Measurements of High Latitude Magnetosphere-Ionosphere Coupling

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm22a..06l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM22A-06

Physics

2706 Cusp, 2721 Field-Aligned Currents And Current Systems (2409), 2724 Magnetopause And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions (2431), 2740 Magnetospheric Configuration And Dynamics

Scientific paper

In a recent single event study, we have documented the occurrence of strong momentum transfer on old open field lines at high magnetopause latitudes downstream of the cusp. Field-aligned currents couple this momentum to the ionosphere where they give rise to a flow channel whose associated Hall current causes magnetic variations at high latitudes (Svalgaard-Mansurov effect). This phenomenon does not depend on the j × B tension force associated with newly opened field lines. We seek further confirmation of this mode of momentum transfer by examining signatures recorded at two altitudes by Cluster and FAST when the spacecraft were in near magnetic conjunction poleward of the cusp. The spacecraft data are supplemented by ground-based observations where necessary. The control of the strength of this coupling mode by the IMF is also investigated. This work places on a stronger foundation the results on magnetosphere-ionosphere coupling reached in the pilot study.

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