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Temerin & Parady 1980
Temerin, M. and Parady, B. (1980). Observations of ULF electric field fluctuations in the dayside auroral oval. Journal of Geophysical Research 85: doi: 10.1029/JA085iA06p02925. issn: 0148-0227.

Electric field oscillations at frequencies centered below 10 Hz were measured by a payload equipped with double-probe electric field detectors which was launched into the dayside auroral oval during the Greenland rocket campaign on January 11, 1975. These oscillations exceeded an amplitude of 3 mV/m broadband and occurred over a period of about 90 s. These oscillations occurred during a proton injection event when the quasi-static electric field was less than 20 mV/m on the average. However, during a brief 2-s interval the electric field exceeded 50 mV/m. Analysis of the amplitude as a function of the spin frequency showed that the electric field was confined to a plane perpendicular to the magnetic field. The power spectrum was of the form f-6.5¿1.5, where f is the frequency over the range from 8 to 18 Hz. The existence of a large electric field fluctuation is a spatially or temporally confined region of low-amplitude turbulence suggests that this may be an observation of the low-altitude projection of a turbulent region associated with electrostatic shocks which have recently been observed at high altitudes.

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Journal of Geophysical Research
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