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Figure 1: The data for Io's better characterized outbursts is plotted as log(surface area) vs. log(temperature). The diagonals are lines of constant radiated power in W. Significantly, most of the data are at temperatures higher than the boiling point of sulfur, indicated by the long vertical arrow. (This figure is from Blaney et al. [1994]. The cross labeled ``1978'' is from Witteborn et al. [1979]. The end points of the ``Surt'' line connect the 600 K [Sinton et al., 1980] and the 900 K [Johnson et al., 1988] analysis of the 4.8m data of Sinton et al. [1980]. The ``*'' data are from the 1979-1981 survey by Sinton et al. [1983], with a line connecting observations made on the same night. ``Pele'' is IRIS data [Hanel et al., 1979; Pearl and Sinton 1982]. ``Poliahu'' and ``1985'' are from Goguen et al. [1988]. ``1986'' and ``1990'' are from Veeder et al. [1994].)