Physics
Scientific paper
Apr 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968jatp...30..527b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 30, no. 4, pp. 527-534
Physics
Scientific paper
Night-time ionograms, recording enhanced-E at Campbell Island (dip 75·5°S) give information on physical conditions at auroral heights. Ion density, energy flux and electron flux at the maxima of the layers, all vary linearly with atmospheric pressure. The semi-thickness of the enhanced E-layer is one scale height. The analysis considers only the overhead conditions and ionograms showing oblique and sporadic-E echoes in addition to the overhead trace have been rejected; similarly records near times of ionospheric absorption were eliminated. Amplitudes and directions of electric fields are estimated from conductivity and current at E-region heights. Electron density profiles of the enhanced E-region and conductivities per electron give the integrated conductivities, and the total current is deduced from geomagnetic data. The amplitudes of the electric fields are sensitive to the model atmosphere chosen, especially for heights above 120 km. Directions indicate they are mainly polarization fields. When instabilities of the Farley type are present, the polarization is in the opposite sense from the main sample and the amplitudes are significantly lower. The apparent reduction in field amplitude is more likely to be a change in conductivity pattern than an actual decrease in electric field size.
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