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- W2890751431 abstract "Electric currents flowing in the global electric circuit are closed by ionospheric currents. A model for the distribution of the ionospheric potential which drives these currents is constructed. Only the internal electric fields and currents generated by thunderstorms are studied, and without any magnetospheric current sources or generators. The atmospheric conductivity profiles with altitude are empirically determined, and the topography of the Earth’s surface is taken into account. A two-dimensional approximation of the ionospheric conductor is based on high conductivities along the geomagnetic field; the Pedersen and Hall conductivity distributions are calculated using empirical models. The values of the potential in the E- and F-layers of the ionosphere are not varied along a magnetic field line in such a model and the electric field strength is only slightly varied because the segments of neighboring magnetic field lines are not strictly parallel. It is shown that the longitudinal and latitudinal components of the ionospheric electric field of the global electric circuit under typical conditions for July, under high solar activity, at the considered point in time, 19:00 UT, do not exceed $$9,upmu {text{V/m}}$$ , and in the sunlit ionosphere they are less than $$2,upmu {text{V/m}}$$ . The calculated maximum potential difference in the E- and F-layers is $$42,{text{V}}$$ ; the maximum of the potential occurs above African thunderstorms that are near the terminator at that time. A weak local maximum also exists above the thunderstorm area in Central America. The minimum potential occurs near midnight above the Himalayas. The potential has identical values at ionospheric conjugate points. The voltage increases to $$55,{text{V}}$$ at 23:00 UT and up to $$72,{text{V}}$$ at 06:00 UT, when local midnight comes, respectively, for the African and Central American thunderstorm areas. These voltages are about twice as large at solar minimum. With our more realistic ionospheric model, the electric fields are an order of magnitude smaller than those found in the well-known model of Roble and Hays (J Geophys Res 84(A12):7247–7256, 1979). Our simulations quantitatively support the traditional presentation of the ionosphere as an ideal conductor in models of the global electric circuit, so that our model can be used to investigate UT variations of the global electric circuit." @default.
- W2890751431 created "2018-09-27" @default.
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- W2890751431 date "2018-09-15" @default.
- W2890751431 modified "2023-09-27" @default.
- W2890751431 title "Mathematical Simulation of the Ionospheric Electric Field as a Part of the Global Electric Circuit" @default.
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- W2890751431 doi "https://doi.org/10.1007/s10712-018-9499-6" @default.
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