Observations of ULF electric field fluctuations in the dayside auroral oval

Details Observations of ULF electric field fluctuations in the dayside auroral oval Observations of ULF electric field fluctuations in the dayside auroral oval

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.2925t&link_type=abstract

Journal of Geophysical Research, vol. 85, June 1, 1980, p. 2925-2934.

Physics

Auroras, Diurnal Variations, Electric Field Strength, Extremely Low Radio Frequencies, Daytime, Electrostatic Charge, Greenland, Magnetometers, Particle Spin, Power Spectra, Rocket Flight, Satellite-Borne Instruments, Scattering Amplitude

Scientific paper

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 to the -6.5 + or - 1.5 power, where f is the frequency over the range from 8 to 18 Hz. The existence of a large electric field fluctuation in 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 higher altitudes.

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