PLANETARY MAGNETIC FIELDS. “Their undisturbed fields can be described in first order as dipolar fields. The region which is dominated by the planetary magnetic field is called the magnetosphere. Its dominating pressure is exerted by the magnetic field and the trapped charged particles within the magnetosphere while in the surrounding interplanetary space the dominant pressure is created by the solar wind. This external pressure compresses the planetary dipolar field at the dayside and forms a long magnetotail on the nightside.”
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