Abstract
Calculations of the response of F region plasma to rapid subauroral ion drifts (SAID) show that the maximum field‐aligned drift is a strong function of the time scale over which the SAID is applied. For SAID velocities of 2 km s−1 the peak field‐aligned drifts can vary by almost a factor of 10 for differences in the onset time scale from a few seconds to a few minutes. Reasonable considerations of the convective configuration in a SAID event suggest that acceleration times between 10 and 20 min might typically be expected. In such cases, much smaller field‐aligned velocities should be observed than would be predicted assuming an essentially instantaneous turn on of the SAID event.
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