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- W1663559652 abstract "Abstract : Large scale density irregularities in the nighttime auroral zone F-region are routinely detected by a pair of pulsed plasma probes on the s3-4 satellite. The absolute density variations can be as large as an order of magnitude and in the case of a quiet diffuse aurora, the irregularities appear to be consistent with the sheet-like structures that have been postulated to explain high latitude scintillation enhancements. In a more dynamic situation, which we believe to be a surging aurora, the density variations may be associated with a density gradient and/or current-driven plasma instability. We have made preliminary analyses of the density fluctuations and FFT power spectra for evidence of characteristic scale sizes and power law dependence. Scale sizes from 10-300 km are clearly evident in the irregularities; power law fits to the spectra have spectral indices in the range -1.5 to -1.7. For the diffuse aurora our results suggest support for a recent numerical study of the nonlinear evolution of the current convective instability. (Author)" @default.
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- W1663559652 date "1981-05-26" @default.
- W1663559652 modified "2023-09-27" @default.
- W1663559652 title "The STP/S3-4 satellite experiment - High latitude large scale density irregularities" @default.
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