Disturbance of the Electric Field in the D-Region of the Ionosphere with an Increase in Radon Emanation

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Abstract

When radon emanates, the conductivity in the surface layer of air increases, which causes a variation in the electric field not only in the lower part of the atmosphere, but also in the ionosphere. There are known proposals to use such ionospheric disturbances as precursors of earthquakes. The ionospheric electric fields are calculated in the framework of a quasi-stationary model of an atmospheric conductor including the ionosphere. Earlier, we showed that even with extreme radon emanation, electric field disturbances in the E- and F- regions of the ionosphere are several orders of magnitude smaller than the supposed precursors of earthquakes and than the fields usually existing there which are created by other generators. In this paper, we focus on the D-region. In the vertical component of the electric field strength, the main contribution in the D-region is the contribution of the fair-weather field. It is shown that in the D-region the vertical component of the electric field over the area of intense radon emanation can double in comparison with the fair-weather field. A detailed spatial picture of disturbances of electric fields and currents in the atmosphere and in the ionosphere over the radon emanation region is constructed.

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About the authors

V. V. Denisenko

Institute of Computational Modelling of the Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: denisen@icm.krasn.ru
Russian Federation, Krasnoyarsk

N. V. Bakhmetyeva

Lobachevsky National Research University

Email: nv_bakhm@nirfi.unn.ru
Russian Federation, Nizhny Novgorod

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Supplementary files

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2. Fig. 1. Altitude profiles of the conductivity tensor components at noon of the vernal equinox over Kamchatka at high solar activity (index F10.7 = 130).

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3. Fig. 2. Potential distribution and current lines (dashed lines) in the vertical half-plane y = 0, x > 0 in the atmosphere above the radon emanation region. The potential values are indicated near the main equipotentials (bold lines).

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4. Fig. 3. Vertical components of current density at two heights (dashed lines) and electric field strength above ground (solid curve).

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5. Fig. 4. Radon emanation-induced perturbation of the potential δV. Bold lines are equipotentials δV with the same step in the logarithmic scale with the indicated potential values. Above 85 km, additional equipotentials with a step of 0.02 mV (thin lines) are plotted. The lines of the current δj, additional to the good-weather current, are shown as dashed lines at 5 km × 2 pA/m2 intervals at 10 km altitude.

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6. Fig. 5. Current lines for δj. Bold lines - projections on the horizontal plane of current lines starting at an altitude of 50 km. Thin lines - cross sections of the current tube by horizontal planes located at altitudes from 70 to 150 km.

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7. Fig. 6. Altitudinal course of the electric field strength components. Solid curve - perturbation due to radon emanation δEy ≈ δEx, dashed line - perturbation δE||, dots - longitudinal component of the good weather field E0||.

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