Abstract
Until quite recently, astronomical problems associated with tidal friction have arisen mainly in connection with the dynamics of the Earth-Moon system. However, since 1979, when the existence of phenomena thought to be of volcanic origin were detected by the Voyager spacecraft on the Jovian satellite Io, tidal friction was regarded also (among other possibilities) as providing the requisite source of heat. Peale et al. (1979) or Yoder (1979) invoked to this end the dissipation of dynamical tides raised by Jupiter on Io considered as a solid globe of imperfect elasticity — an interesting idea even if it was not quite new; for the present writer proposed the same idea many years before (cf. Kopal 1963) in connection with our Moon.
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