It is shown from the dynamo equations that the cyclonic turbulence and nonuniform rotation of the gaseous disk of the Galaxy generate magnetic field in both periodic and nonperiodic modes. Order-ofmagmtude estimates of the dynamo number suggest that the large-scale galactic field is generated in the lowest even periodic and/or nonperiodic modes. The characteristic period of the periodic mode is estimated at 108 years. The large amplitude of the small-scale (lO pc) fluctuations in the internal field of the Galaxy make it difficult to compare the local field observations with theory to designate the mode of the large-scale field extending throughout the disk.
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E. N. Parker (1971) studied this question.