Abstract
Fast time resolution particle measurements on six French rockets flown into auroras at times near local midnight indicate that statistically significant intensity variations of electrons with energies from 65 to > 400 kev on time scales as short as several milliseconds often occur. Similar fluctuations of proton intensity are nearly absent. Variations occurring only for electrons with energies near 65 kev as well as variations involving only electrons with E > 400 kev have been observed. Detailed analyses of 75 examples of rapid intensity variations fail to reveal whether they are typically caused by spatial or temporal inhomogeneities Since the first observation of a fluctuation occurs as often in the lowest energy channel as in the highest, there is no significant energy dispersion of arrival times of electrons at the rocket. Thus, if the variations are temporal, the source must be closer than about 1 RE from the rocket. If the variations are spatial, the electron guiding center density must occasionally change by an order of magnitude over horizontal distances less than 20 meters.
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