Electromagnetic coupling of geospheres. 2. Disturbances in the magnetosphere
Heading:
| 1Chernogor, LF 1V.N. Karazin Kharkiv National University, Kharkiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2025, 41(2):3-30 |
| https://doi.org/10.15407/kfnt2025.02.003 |
| Language: Ukrainian |
Abstract: The paper is devoted to the analysis of the electromagnetic mechanism of subsystems interaction in the Earth — atmosphere — ionosphere — magnetosphere system. The basis is a system of equations for the volume density of electromagnetic energy and the total electron content of high-energy electrons in a magnetic flux tube, which describes the wave — particle resonant coupling at the cyclotron frequency. The purpose of this paper is to obtain analytical solutions to a system of equations describing the interaction of powerful electromagnetic radiation with magnetospheric high-energy electrons and numerical modeling of the main parameters of this interaction. Solutions to stationary and nonstationary problems have been obtained. Aperiodic and quasiperiodic disturbance regimes are revealed. The values of the stationary relative disturbance of the total electron content depending on the parameters of particle sources and electromagnetic radiation are calculated. The values of a number of the magnetospheric and ionospheric parameters are calculated depending on the parameters of the sources of electrons and electromagnetic radiation. It has been shown that the radiation of a single lightning can lead to significant electron flux densities (~105… 1011 m-2s-1). In this case, the electron density in the ionosphere can increase from tens of percent to hundreds of times. The disturbances of the geomagnetic and ionospheric electric fields caused by ionization bursts in the ionosphere have been calculated. The amplitude of geomagnetic field disturbances varied from fractions to hundreds of nanoteslas, while the electric field disturbances ranged from 10 µV to 100 mV. Secondary effects in the EAIM system caused by the electromagnetic disturbance mechanism are briefly considered. |
| Keywords: disturbance of the electric field, disturbance of the geomagnetic field, electromagnetic radiation, lightning, magnetic flux tube, magnetosphere, precipitation of high-energy electrons, total electron content, trigger effect, volume density of electromagnetic energy |
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