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
Hilmer-Voigt: Equatorward Edge
Conclusions
- The Hilmer-Voigt model has three adjustable parameters:
- The Equatorward Edge of the Auroral Oval
- The Magnetopause Stand-Off Distance
- Ring Current Strength (measured by Dst)
- We adjusted each of these parameters independently, keeping the others fixed, to assess their individual effects. Normally the model would be used with values reflecting actual magnetospheric conditions.
- The equatorward edge of the auroral oval affects all local times but the largest effects are at local midnight.
- The "nominal" latitude of the equatorward edge is 65 deg.
- The IGRF field alone gives foot points which are poleward of even the 55 deg. version of Hilmer-Voigt.
- Hilmer-Voigt allows values of the equatorward edge between 55 deg. and 69 deg.
- The code will adjust input values to fit model parameters. e.g. 55 deg. is reset to 55.89 deg.
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Last updated: Tuesday June, 20 1995