![]() This latter process will be the main focus of this chapter. In contrast, internal sources include remanent magnetization in crustal rocks on Mars, Earth, and the Moon or self-sustaining dynamos in the deep interiors of planets. For example, external sources that generate observed planetary magnetic fields include Venus' ionospheric currents, Earth's magnetospheric currents, and electromagnetic induction in the saltwater oceans of Europa, Ganymede, and Callisto due to Jupiter's time varying field. Observed planetary magnetic fields can result from a variety of processes. įield characterized by significant nondipolar, nonaxisymmetric components.No dynamo-generated magnetic field detectedĭetection of dynamo-generated magnetic fields No nonaxisymmetric field components detected, upper limit on dipole tilt: 0.06° ĭetection of induced magnetic fields in global subsurface oceans of Europa, Ganymede, and Callisto.ĭetailed observations of magnetic field secular variationĭetection of localized crustal magnetic fieldsĭetection of strong localized crustal magnetic fieldsĭetection of dynamo-generated magnetic field, similar in morphology to Earth's fieldĭetection of Ganymede's dynamo-generated magnetic field.Mapping of dynamo-generated and crustal magnetic fields to high resolution ĭetection of small induced magnetosphere due to solar wind–ionosphere interaction. ![]() No dynamo-generated magnetic field detected įield characterized by weak dipole moment, large dipole offset, and small dipole tilt.Detection of dynamo-generated magnetic field ![]()
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