Six Magnetic Field Models Compared:
Mapping Geosynchronous Orbit
to the Auroral Zone

Geoffrey D. Reeves
Loretta A. Weiss, Michelle F. Thomsen and David J. McComas
Los Alamos National Laboratory, Los Alamos NM

In the above plots we examine the dependence of the foot point on the strength of the ring current measured by Dst
Dst values between +50 and -200 were investigated.
The "nominal" value of Dst is -50.
Positive values of Dst move the foot points poleward of their nominal positions.
All other values of Dst give foot points which are essentially indistinguishable.
To compare with the Tsyganenko family of models we note that high Kp correlates with both a compressed magnetopause and a stronger ring current. However, in the Hilmer-Voigt model the dependence on stand-off distance is stronger than the dependence on Dst. Therefore in high Kp conditions the Hilmer-Voigt model predicts that, on average, the dayside foot points should move poleward and the nightside foot points should move equatorward compared to low Kp conditions.

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Last updated: Tuesday June, 20 1995