Chatanika/Triad observations of unstable ionization enhancements in the auroral F-region

Details Chatanika/Triad observations of unstable ionization enhancements in the auroral F-region Chatanika/Triad observations of unstable ionization enhancements in the auroral F-region

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..789v&link_type=abstract

Geophysical Research Letters, vol. 7, Oct. 1980, p. 789-792. Navy-supported research

Computer Science

Sound

6

Auroral Ionization, F Region, Ionospheric Disturbances, Radar Measurement, Satellite Sounding, Augmentation, Field Aligned Currents, Ionospheric Electron Density, Plasma Density, Plasma Drift

Scientific paper

Preliminary results are presented from a campaign of coordinated measurements between the Chatanika radar and the Triad satellite to investigate production mechanisms responsible for localized high-latitude scintillations. The radar measured the latitudinal variations of plasma density and electric field while the satellite measured the field-aligned current distribution with latitude. This information was used to calculate the linear growth rate of the current convective instability. Field-aligned ionization enhancements, a common feature of the auroral F-region, were found to be unstable, with instability growth times of less than about 6 min. The observed plasma configuration, which was already gradient drift unstable on its poleward edge, was further destabilized by a field-aligned current of about 0.8 microA/sq m. The presence of electron density irregularities produced in the unstable region was verified by observing VHF scintillations on the Triad telemetry signal.

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