Temporal Evolution of the Open-Closed Field Line Boundary Determined Using Superdarn Velocity Gradients

Details Temporal Evolution of the Open-Closed Field Line Boundary Determined Using Superdarn Velocity Gradients Temporal Evolution of the Open-Closed Field Line Boundary Determined Using Superdarn Velocity Gradients

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm33a2117h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM33A-2117

Physics

[2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2760] Magnetospheric Physics / Plasma Convection

Scientific paper

The purpose of our current research is to understand magnetospheric dynamics. We investigate the use of ionospheric convection velocity gradients along streamlines using SuperDARN HF radar to determine the open-closed magnetic field line boundary (OCB). We have found that a change in the streamline convection flow from decreasing to increasing, i.e., from a negative to a positive gradient, can be an indicator of the OCB location. In this presentation we will present the temporal evolution of the nightside boundary location over a 3 hour interval from 7:16 to 10:16 UT on November 4, 2001. During this interval the IMF Bz component varied between -2nT to -6nT while the dynamic pressure varied from 1.1 nPa to 3.1 nPa. The OCB determined with the SuperDARN convection velocity gradient method is found to be consistent with other indicators of the OCB such as SuperDARN spectral widths, three far ultraviolet (FUV) detectors onboard the IMAGE spacecraft (the Wideband Imaging camera, WIC, and the Spectographic imagers, SI-12 and SI-13), and satellite particle precipitation measurements. During the interval of interest all OCB indicators show an initial poleward motion followed by an equatorward motion of the nightside OCB which can be associated with changes in IMF Bz and solar wind dynamic pressure.

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