Udc 550
نویسندگان
چکیده
The paper presents the three-dimensional structure of the ionospheric electron density disturbances triggered by the vertical electric currents flowing between the Earth and ionosphere over the faults before the strong earthquakes. The results were obtained using the global numerical Earth's Upper Atmosphere Model (UAM). The vertical electric currents flowing between the Earth and ionosphere over the faults were used as lower boundary conditions for the UAM electric potential equation. The UAM calculated 3D structure of the ionospheric electron density disturbances demonstrates an importance of all three ionospheric plasma drift movements – vertical, meridional and zonal but not only vertical one. Аннотация. В статье представлена трѐхмерная структура вариаций ионосферной электронной концентрации, вызываемых воздействием вертикальных электрических токов, текущих между Землѐй и ионосферой над разломами перед сильными землетрясениями. Исследование проводилось с помощью глобальной трѐхмерной численной нестационарной модели верхней атмосферы Земли UAM. Вертикальные токи, предположительно сейсмического происхождения, задавались в качестве нижних граничных условий для уравнения электрического потенциала модели. Показано, что при рассмотрении физического механизма формирования исследуемых аномалий следует учитывать не только вертикальный перенос плазмы под действием зональной компоненты электрического поля, но и горизонтальные (зональные и меридиональные) движения плазмы F2-области ионосферы.
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