Irkutsk, Russian Federation
Irkutsk, Russian Federation
Irkutsk, Russian Federation
Irkutsk, Russian Federation
We present the results of numerical modeling of a traveling ionospheric disturbance that causes z-shaped bends at the Pedersen ray of oblique incidence ionograms. The results of trajectory synthesis of oblique incidence ionograms are given for the ionosphere, taking into account the traveling ionospheric disturbance. In the work, we use the International Reference Ionosphere, adapted to experimental data, and the Model of Ionosphere and Plasmasphere.
ionosphere, oblique sounding, ionogram, traveling ionospheric disturbances
ВВЕДЕНИЕ
Исследованию ионосферных неоднородностей, в том числе перемещающихся ионосферных возмущений (ПИВ), посвящено большое количество работ [Maeda, Handa, 1980; Иванов и др., 1987; Бойтман, Калихман, 1989; Вугмейстер и др., 1993; Millward et al., 1993; Hocke, Schlegel, 1996; Афраймович и др., 2002; Ding et al., 2008]. Одновременно с суточными и сезонными вариациями параметров ионосферы (крупномасштабными неоднородностями) на высотах ионосферы всегда присутствуют движущиеся ионизированные структуры мелких и средних масштабов.
Несмотря на появление и развитие космических средств зондирования, благодаря которым появилась возможность получать полное электронное содержание [Афраймович, Перевалова, 2006], исследование ионосферы с помощью ионозондов с линейной частотной модуляцией сигнала является актуальным и иногда единственным способом получения информации о канале связи. Важно понимать факторы, которые могут приводить к искажениям дистанционно-частотных характеристик (ДЧХ) наклонного зондирования (НЗ) и к отклонениям от средних значений колебаний суточного хода максимальных наблюдаемых частот (МНЧ). Вариации МНЧ с периодами более одного часа на трассах НЗ могут объясняться крупномасштабными ПИВ, проходящими трассу зондирования на высотах F-области [Кутелев, Куркин, 2011]. Вариации МНЧ меньших периодов часто сопровождаются наличием на ДЧХ z-образных перегибов на односкачковой моде 1F2 [Вертоградов и др., 2008], которые двигаются с течением времени по верхнему лучу (Педерсена) из области более высоких в область более низких задержек (иногда повторяя такое прохождение несколько раз).
Целью работы было моделирование ПИВ, приводящего к z-образным перегибам на луче Педерсена на ДЧХ. Для моделирования среды распространения привлекались модели: International Reference Ionosphere (IRI) с коррекцией по реальным данным наблюдений и Глобальная модель ионосферы и плазмосферы (ГМИП), разработанная в ИСЗФ СО РАН.
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