Journal of Radio Electronics. eISSN 1684-1719. 2025. №4
Full text in Russian (pdf)
DOI: https://doi.org/10.30898/1684-1719.2025.4.8
Effect of strong local atmospheric
disturbance on the radiation resistance
of a low-frequency loop antenna located
in the Earth's ionosphere
A.V. Moshkov
Kotelnikov IRE RAS
125009, Russia, Moscow, Mokhovaya str., 11, b.7
The paper was received January 13, 2025.
Abstract. A low-frequency loop antenna located in the ionosphere can be an effective diagnostic tool for determining the parameters of strong local atmospheric disturbances. The source of such disturbances can be the intrusion of meteoroids into the atmosphere. The input impedance of the loop antenna in the undisturbed ionosphere weakly depends on the parameters of the surrounding magnetoactive plasma, so an inhomogeneity of the environment does not disrupt the matching of the loop with the transmitter. The article presents the results of numerical calculations of radiation resistance and reactance values of the low-frequency loop antenna located in the ionosphere in the frequency range of 1...10 kHz. The parameters of the ionospheric plasma (ionization value, temperature, effective frequency of electron collisions) change in time under the influence of a strong local disturbance emerging in the atmosphere. It is shown that as the disturbance region approaches the antenna, the magnitude of the radiation resistance is significantly different from the background values, first in the direction of increase, and then in the direction of decrease, down to a value of the order of the radiation resistance in free space. The duration of these disturbances is in the range from 15 to 30 s with a change in the initial energy of the atmospheric disturbance from 1 to 10 PJ. The antenna reactance changes by several orders of magnitude, which makes it difficult to match it with the transmitter, especially at frequencies exceeding the lower hybrid frequency.
Key words: low frequencies, lower ionosphere, strong local disturbance, enhanced ionization, loop antenna, radiation resistance.
Financing: the work was carried out on the topic of the state assignment of the Kotelnikov IRE RAS No. FFWZ-2022-0014.
Corresponding author: Moshkov Aleksandr Vladimirovich, kuzaf@inbox.ru
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For citation:
Moshkov A.V. Effect of strong local atmospheric disturbance on the radiation resistance of a low-frequency loop antenna located in the Earth's ionosphere. // Journal of Radio Electronics. – 2025. – №. 4. https://doi.org/10.30898/1684-1719.2025.4.8 (In Russian)