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Fig. 1.

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Timescales relevant to the acceleration of a silicate dust grain of size a = 10−6 cm and shock velocity ush = 109 cm/s vs. the grain velocity, β, in units of c. The relevant typical times shown are: the acceleration time, τacc (solid black), the grain-grain interaction time, τg − g (solid thin green), the gyration time (dashed blue), the grain loss time from frictional interactions with the background plasma (dashed red), the associated sputtering time (dash-dotted thin orange), and the thermal sputtering time (dotted thin orange).

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