Measurements of E region ionization and conductivity produced by solar illumination at high latitudes

Details Measurements of E region ionization and conductivity produced by solar illumination at high latitudes Measurements of E region ionization and conductivity produced by solar illumination at high latitudes

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.3951r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, June 1, 1984, p. 3951-3956. Research supported by the Lockheed Indepe

Physics

69

Atmospheric Ionization, E Region, Ionospheric Conductivity, Ionospheric Electron Density, Solar Flux, Solar Position, Solar Terrestrial Interactions, Auroras, Electron Density Profiles, Extreme Ultraviolet Radiation, Hall Effect, Particle Precipitation

Scientific paper

Data from the Chatanika radar have been used to deduce the electron density as a function of altitude between 90 and 250 km for five solar zenith angles and four levels of solar flux. The electron density profiles were used to compute the height-integrated Hall and Pedersen conductivities. The resulting conductances varied as (S/alpha/ cos chi) exp 0.5, where chi is the solar zenith angle and S/alpha/ is the 10.7 cm solar flux, to within about 20 percent. These conductances agree well with previous results that did not include the dependence on solar flux. The importance of photoionization relative to precipitation was evaluated by computing the energy flux and average energy of a Maxwellian electron beam required to produce the same conductances. The Hall to Pedersen ratio was 1.7, equivalent to that produced by a Maxwellian electron beam with an average energy of 4.6 keV. It is concluded that photoionization at high latitudes can produce conductances comparable to those found in the diffuse aurora.

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