Elevated electron temperatures in the auroral E layer measured with the Chatanika radar

Details Elevated electron temperatures in the auroral E layer measured with the Chatanika radar Elevated electron temperatures in the auroral E layer measured with the Chatanika radar

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.4721w&link_type=abstract

Journal of Geophysical Research, vol. 86, June 1, 1981, p. 4721-4730. Research supported by the Centre National de la Recherche

Physics

69

Auroral Zones, E Region, Electron Energy, Ionospheric Temperature, Radar Measurement, Aeronomy, Ionospheric Electron Density, Least Squares Method, Ohmic Dissipation, Signal Processing, Temperature Profiles

Scientific paper

A spectral shape with two well-developed peaks, most pronounced at approximately 105 and 110 km, is analyzed, and a theory of enhanced electron temperature suggested as the possible cause, is discussed. Auroral particle participation and Joule heating were ruled out initially as the possible sources for the increase of temperature. It is proposed that electric fields of 24-40 mV/m are present and that the electrons are moving through the ions and neutrals at speeds of 500-800 m/s. However, results show a lack of correlation between the electron densities and the electron temperatures indicating that the energy source is not the incident flux of primary electrons. Instead, the correlation with higher altitude ion temperatures suggests a relationship with Joule heating, since they occur simultaneously with large Joule events. It is concluded that enhanced electron temperatures will have effects on the E region aeronomy, to cause reduced recombination rates, and they must be taken into account for the interpretation of the incoherent scatter data during periods of Joule heating.

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