Abstract
Electric field measurements from the long‐wire double‐probe instrument (baseline of 179 m) on ISEE 1 have shown the magnetospheric electric field on auroral L shells to be extremely turbulent during periods of magnetic activity. During intense activity these turbulent electric fields can penetrate to very low L values. The variational component of the electric field is typically larger than the DC value. Measurements are presented at frequencies up to 14 Hz. Magnitudes of over 40 mV/m (zero to peak) have been observed with spectral power levels in the 1–10 Hz range greater than 10 mV²/m² Hz. The spectral shape of the most intense events was generally flatter than that predicted by two‐dimensional hydromagnetic cascading of energy, which argues that the source of this turbulence must be driving the plasma near these frequencies. This in turn suggests that the instability is in the low‐energy plasma.
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