Abstract
An exact solution is given of an idealised problem, approximately treated by S. Chapman and the writer in an earlier paper dealing with the radial stability of a geomagnetic ring, in which the ring is replaced by an electrically neutral uniform cylindrical current‐sheet whose axis is parallel to the magnetic axis of the Earth. The conclusions of that paper are substantiated, and though it is shown that the sheet is in reality unstable, the rate at which instability sets in is so slow that the sheet may well be considered to be stable. This rate is, moreover, comparable with the rate of decrease of intense and moderate magnetic storms.
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