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Spicules and other solar jets such as bright points and fibrils generallyshow a parabolic height-time relationship, which means that each spicule has aconstant deceleration. However the deceleration is only constant for aparticular spicule and varies widely from one spicule or jet to another.Nonetheless the careful observations of a number of researchers show that thedistance - time relationship is parabolic to a high level of precision. Themeasurements for heights, maximum velocities, decelerations and flight timesare normally presented as histograms or scatter plots, which allow some generaltrends to be observed. The published results show a clear correlation betweenthe maximum velocity and the deceleration of spicules on scatter plots. Thiscorrelation has been claimed to show a linear relation between the accelerationand the maximum velocity of a jet. This linear relationship has been used tohelp model the mechanisms responsible for the jets. However it is proposed herethat the relation between velocity and acceleration is given by the normalequations of motion for constant acceleration and consequently the relationshipis non-linear. Other correlations are also examined and the implications forspicule mechanisms are considered.

Spicules: velocity, acceleration and scatter plots