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Hydromagnetic motions in the magnetosphere

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Abstract

Following a brief specification and historical review of hydromagnetic motions in the magnetosphere, the principles of the governing and limiting processes are surveyed. A formal proof of the well-known hydromagnetic theorem is included, and its interpretation in terms of ‘frozen fields’ is discussed. Some consequences of its application to the magnetosphere are then described, and the value of equipotentials as a means of illuminating the discussion is established. Departures from the hydromagnetic approximation are then evaluated, and their resultant currents described.

The general principles find application in a number of processes: rotation, high-latitude circulation in quiet and disturbed conditions, more widespread convection under continuous dynamo action, and irregular motion both of an unstable and of a forced type. All these are reviewed, and one emergent point is emphasized: that direct evidence for the hydromagnetic motions is lacking, but that it can and should be sought.

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Authors and Affiliations

  1. Department of the Geophysical Sciences, University of Chicago, Chicago

    C. O. Hines

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Hines, C.O. Hydromagnetic motions in the magnetosphere. Space Sci Rev 3, 342–379 (1964). https://doi.org/10.1007/BF00230517

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