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Magnetic-field reconnection may be essential in a variety of solar and astrophysical phenomena, and there has been much debate as to the maximum allowable rate of reconnection. Petschek's mechanism, for instance, permits a maximum rate of about one-tenth of the Alfven speed, UA, but is probably unworkable. Yeh and Axford, on the other hand, have recently claimed that any rate is possible up to UA. A more careful matching of the internal and external regions in Yeh and Axford's mechanism is here performed, with the condusion. that the highest rate of reconnection is about UA/l8. Subject headings: flares, solar - hydromagnetics - plasmas
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E. R. Priest (1973) studied this question.
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