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By Seares F. H.

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40) We will attribute to the Ψ angle the same sign of magnetic element D previously introduced. 41) as we obtain immediately from the dipole equation. Being the magnetic central dipole only an approximation, the measured field on the Earth’s surface at any point can differ also significantly from the theoretical dipolar field. A theoretical geomagnetic pole can be defined from the field measured at a given point as the geomagnetic pole that would be obtained considering the field at that point, as it was simply a dipolar field.

Taken together the solar wind, the magnetosphere and the ionosphere form one dynamical system guided by the energy coming from the solar wind and transferred to the magnetosphere and ionosphere. This energy transfer is particularly evident in correspondence of the so-called CME (coronal mass ejection), solar plasma impulsive emissions that spread through interplanetary space, and is controlled by the interplanetary magnetic field, that is the magnetic field of solar origin transported by the solar wind.

The solar wind is not uniform, although always directed away from the Sun, it can change speed and carries a feeble magnetic field of solar origin, the interplanetary magnetic field (IMF). As a consequence of the solar wind expansion in the solar system, the Earth’s magnetic field is confined by this low density plasma and is immersed in the IMF, both originating in the Sun. The cavity in which the Earth is bounded is called magnetosphere and shows a quite different shape with respect to the pure magnetic dipolar field (Fig.

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Deviations of the Suns General Magnetic Field from That of a Uniformly Magnetized Sphere(en)(5s) by Seares F. H.


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