In-situ measurements ofwave electric fields in the equatorial electrojetGeophysical Research Letters (1982)
AbstractElectric field wave measurements have been performed on two sounding rockets in the equatorial ionosphere. During a daytime flight from Chilca, Peru, intense electrostatic waves were detected on the upward directed electron density gradient. During a nighttime flight from Kwajalein Atoll, similar waves were detected on a downward directed gradient. These results are in agreement with a gradient drift instability explanation of the generation of the waves. The wave amplitudes were as high as 5 mV/m implying perturbation drifts comparable to the driving drift velocities. Power spectra from the turbulent region show a peak at long wavelengths, followed by a nearly flat spectral region before breaking into a power law form with negative index of 3.6–3.7 for λ≤30m. Similarities between the spectra of the two flights suggest that the fundamental processes of the instabilities are the same in the day and nighttime conditions. The rocket data are consistent with radar results presented in a companion paper which show coherent, kilometer scale waves present in the electrojet.
Publication DateJune, 1982
Citation InformationPfaff, R. C., M. C. Kelley, B. G. Fejer, N. C. Maynard, and K. D. Baker, In-situ measurements of wave electric fields in the equatorial electrojet, Geophys. Res. Letts., 9, 688, 1982.