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Equator‐S made many magnetopause crossings between 06 00 and 10 40 LT, taking magnetic field data at 64 or 128 vectors/s. This allows structure within the shortest crossings to be examined, and examples having an exceptionally smooth ramp in | B | are presented. These crossings show no significant structure at sub‐kilometre scales. Strong electromagnetic wave activity did not occur within the ramp, although some crossings have extremely low amplitude compressional waves in part of the field ramp close to the magnetosphere, with frequencies close to the lower hybrid frequency. These initial results suggest that physical processes on sub‐km scales play no role in determining the structure of the current layer.
Lucek et al. (Thu,) studied this question.