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Published online by Cambridge University Press: 14 August 2015
Many features observed in solar prominences, planetary nebulae and the terrestrial magnetosphere (e.g. the filamentary structure, suspended clouds and arcs or toroids hovering above the equator) lead to the conviction that magnetic fields play a significant role in these objects. The magnetic mechanism (Woyk, 1967) described briefly below may be able to explain the shapes of all known planetaries. The field intensity sufficient for supporting the mechanism described need not exceed about 10−6–10−4G.