Physics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..687v&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 6, p. 687-694
Physics
9
Atmospheric Models, Clouds (Meteorology), Electric Fields, Electrical Resistivity, Electron Distribution, Geomagnetism, Ionospheres, Thunderstorms, Altitude, Boundary Conditions, Exponential Functions, Horizontal Distribution, Maxwell Equation
Scientific paper
In a previous paper, we considered the penetration of direct current (DC) thundercloud electric fields E into the ionosphere and also into the region between the ionosphere and the ground (Velinov and Tonev, 1994). In the present paper, we extend the analysis by making a more precise approximation of the electric conductivity profiles by 5-10 piecewise exponential functions of altitude instead of the two functions used up to now. This allows a much more realistic representation of the atmospheric conductivity profile. Besides, Maxwell's equations are solved for more general boundary conditions, taking into account that the electrosphere is not a perfect conductor. This leads to the appearance not only of the transverse E(sub r) (as had been assumed until now), but also of the geomagnetic field-aligned E(sub z) component of the penetrating thundercloud electric fields. The computations show that both E(sub r) and E(sub z) cause significant variations of the electron density profiles N(z) in the ionosphere.
Tonev P. T.
Velinov P. I.
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