Physics
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47.1129j&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 47, Nov. 1985, p. 1129-1142.
Physics
16
D Region, E Region, Extremely Low Frequencies, Ionospheric Conductivity, Auroral Zones, Direct Current, Ionospheric Currents, Night Sky, Vertical Distribution, Waveforms
Scientific paper
Currents that flow when the D/E-region conductivity is time modulated in the presence of an auroral dc electric field are evaluated at the heating facility at Tromso, Norway with a collisional theory of ohmic heating and cooling. Steady-state variation of electrojet currents are computed for all altitudes in the D/E-regions. The dependence of absorption and conductivity on electron density and electron temperature is analyzed. Use of the Fourier transform to convert the computed time-domain conductivity to frequency domain is described. Altitude profiles of dc and ac conductivity up to the fifth harmonic for an ELF pulsing frequency of 525 Hz under high-latitude day and night conditions are presented. The results reveal characteristic spectra for three regions in the height range in daytime (up to 65 km, around 75 km, and above 85 km), and at night only to regions (between 85-95 km and above 95 km). A comparison of observed and theoretical data reveals poor correlation.
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