单词	Alfvénic
释义	Alfvénic adjective Alf·​vén·​ic ¦al(f)-¦vā-nik  -¦ve- : of, relating to, or having the characteristics of an Alfvén wave Alfvénic velocity In a magnetic nozzle the Alfvén speed plays a role similar to that of the sound speed in a conventional nozzle. The transition from sub-Alfvénic to super-Alfvénic flow delineates a boundary beyond which the flow downstream has no effect upstream—which ensures that the detachment exerts no drag on the rocket. Franklin R. Chang Díaz, Scientific American, November 2000 Word History Etymology Hannes Alfvén + -ic entry 1 First Known Use 1964, in the meaning defined above
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