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The external magnetic field is not symmetric due to solar influence. We concentrate the attention on the Tsyganenko models that are semi-empirical best-fit representations for the magnetic field, based on a large number of satellite observations. The models include the contributions from major external magnetospheric sources: ring current, magnetotail current system, magnetopause currents, and large-scale system of field-aligned currents. The models adopted are described as follow:

 Tsyganenko1

Figure 1: Animation on how the magnetospheric field varies in response to the diurnal wobbling of the geodipole.

http://geo.phys.spbu.ru//~tsyganenko/modeling.html

Tsyganenko2

Figure 2: Animation on the interaction between the terrestrial and interplanetary fields.

http://geo.phys.spbu.ru//~tsyganenko/modeling.html

Tsyganenko4

Figure 3: Animation illustrating the dynamical changes of the global magnetic field in the course of a disturbance.

http://geo.phys.spbu.ru//~tsyganenko/modeling.html

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