An evaluation of recent quantitative magnetospheric magnetic field models

Physics – Space Physics

Scientific paper

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Atmospheric Models, Earth Magnetosphere, Geomagnetic Tail, Magnetic Fields, Current Sheets, Geomagnetism, Lines Of Force, Magnetic Dipoles, Magnetopause, Polar Regions

Scientific paper

Magnetospheric field models involving dipole tilt effects are discussed, with particular reference to defined magnetopause models and boundary surface models. The models are compared with observations and with each other whenever possible. It is shown that models containing only contributions from magnetopause and tail current systems are capable of reproducing the observed quiet time field just in a qualitative way. The best quantitative agreement between models and observations take place when currents distributed in the inner magnetosphere are added to the magnetopause and tail current systems. One region in which all the models fall short is the region around the polar cusp. Obtaining physically reasonable gradients should have high priority in the development of future models.

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