An observational test of the Tsyganenko (T89a) model of the magnetospheric field

Details An observational test of the Tsyganenko (T89a) model of the magnetospheric field An observational test of the Tsyganenko (T89a) model of the magnetospheric field

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10124827t&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A11, p. 24827-24836

Physics

Plasma Physics

32

Magnetospheric Physics: Current Systems, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Space Plasma Physics: Kinetic And Mhd Theory

Scientific paper

The range of magnetic field tilt angles observed at several satellites in geosynchronous orbit is compared with the ranges predicted for the same locations by the different Kp parametrizations of the Tsyganenko 1989a magnetic field model as a function of local time and season. The data are examined separately for satellite locations near the magnetic equator and slightly off the equator. The model predicts reasonably well the observed basic variation in the tilt angle with location, and it permits a range of field inclinations adequate to encompass the majority of the observed angles for the dawn, dusk, and night quadrants. On the dayside of the magnetosphere the model exhibits very little variation in tilt over the entire range of parametrizations and cannot reproduce the observed range of tilt angles. Near the magnetic equator the majority of observed tilt angles lie within the model range, with roughly equal numbers of cases that are overstretched or understretched with respect to the model range. Off the equator the models tend to be more stretched than is generally observed. With some modest season-to-season differences these results are valid for all four seasons.

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