F region electron density irregularity spectra near auroral acceleration and shear regions

Details F region electron density irregularity spectra near auroral acceleration and shear regions F region electron density irregularity spectra near auroral acceleration and shear regions

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.5554b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, July 1, 1984, p. 5554-5564.

Computer Science

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26

Auroral Spectroscopy, Electron Precipitation, F Region, Ionospheric Drift, Ionospheric Electron Density, Polar Substorms, Energy Spectra, Explorer 54 Satellite, Ionospheric Conductivity, Ionospheric Sounding, Magnetohydrodynamic Stability, Shear Flow

Scientific paper

Two orbits of the Atmosphere Explorer D yielded data on F region electron irregularities in the high latitude ionosphere. Data were taken with a retarding potential analyzer, an ion drift meter, a low energy electron experiment and a photoelectron spectrometer. Auroral forms were simultaneously visually sighted by DMSP spacecraft. The irregularities were associated with auroral excitation and large structured flow regions. Steep spectra with one-dimensional spectral index values for wavelengths over 1 km were observed in the acceleration region. Large amplitude irregularities appeared in large structured flow regions and displayed shallow spectra, indicating the presence of large power spectral densities at scale lengths of about 100 m. It is suspected that large velocities or shears in the velocities in adjacent precipitation regions cause the F region density perturbations.

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