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The paper addressed to the problem of the solar wind behaviour during theMaunder Minimum. Records on plasma tails of comets would allow to shed light onthe physical parameters of the solar wind in the past. We analyse descriptionsand drawings of comets to the eighteenth century. To differentiate dust andplasma tails, we address to their color, shape and orientation. Basing on thecalculations made by F.A. Bredikhin, we found that deviation of cometary tailsfrom the antisolar direction on average exceeded 10 degrees, that is typicalfor dust tails. Catalogues of Hevelius and Lubieniecki are also examined. Thefirst indication of plasma tail was revealed only for Great comet C/1769 P1.

Indirect solar wind measurements using archival cometary tail observations