The structure of localized nighttime auroral zone scintillation enhancements

Computer Science – Sound

Scientific paper

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Auroral Zones, Ionospheric Sounding, Night Sky, Satellite Sounding, Scintillation, Ionospheric Currents, Ionospheric Disturbances, Ionospheric Electron Density, Magnetic Field Configurations

Scientific paper

Simultaneous observations of the polar-orbiting Wideband satellite at two auroral zone stations were made during November 1977. The latitudinal distribution of the average scintillation occurrence at each station shows a local maximum at the point where the propagation vector lies within an L shell. This supports the hypothesis that the enhancement is a geometrical effect due to L shell aligned, sheetlike irregularities. The detailed structure of the average scintillation occurrence and of scintillation patterns on individual passes shows, however, that the source regions are confined in latitude. From a detailed analysis of total electron content data it was shown that the local scintillation enhancements occur in a region of enhanced F region ionization with a steep gradient at its equatorward edge. These results are discussed in light of analysis by Osakow and Chaturvedi (1979) that shows that the current convective instability can explain the irregularities.

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