Solnechno-Zemnaya Fizika Solnechno-Zemnaya Fizika Солнечно-земная физика 2712-9640 82730 10.12737/szf-103202409 ДЕВЯТНАДЦАТАЯ ЕЖЕГОДНАЯ КОНФЕРЕНЦИЯ «ФИЗИКА ПЛАЗМЫ В СОЛНЕЧНОЙ СИСТЕМЕ», 5–9 ФЕВРАЛЯ 2024 Г., ИНСТИТУТ КОСМИЧЕСКИХ ИССЛЕДОВАНИЙ РАН, МОСКВА, РОССИЯ 19TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 5–9, 2024, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA ДЕВЯТНАДЦАТАЯ ЕЖЕГОДНАЯ КОНФЕРЕНЦИЯ «ФИЗИКА ПЛАЗМЫ В СОЛНЕЧНОЙ СИСТЕМЕ», 5–9 ФЕВРАЛЯ 2024 Г., ИНСТИТУТ КОСМИЧЕСКИХ ИССЛЕДОВАНИЙ РАН, МОСКВА, РОССИЯ Conditions for the occurrence of intense fluxes of energetic electrons at L<1.2 associated with solar activity and solar wind parameters Условия появления интенсивных потоков энергичных электронов на L<1.2, связанные с солнечной активностью и параметрами солнечного ветра Суворова Алла Васильевна Suvorova Alla Vasil'evna all@yahoo.com

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Дмитриев Алексей Владимирович Dmitriev Alexei Vladimirovich dalex@jupiter.ss.ncu.edu.tw Научно-исследовательский нститут ядерной физики им. Д.В. Скобельцина МГУ Москва Россия Skobeltsyn Institute of Nuclear Physics, Moscow State University Moscow Russian Federation Научно-исследовательский институт ядерной физики им. Д.В. Скобельцина МГУ, Москва , Россия Москва Россия Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow , Russian Federation Moscow Russian Federation Факультет космических наук и инженерии, Национальный Центральный Университет, Тайвань Тайвань Китайская Республика Department of Space Science and Engineering, National Central University, Taiwan Taiwan Taiwan 29 09 2024 29 09 2024 10 3 79 87 30 04 2024 17 06 2024 https://zh-szf.ru/en/nauka/article/82730/view

В работе представлены результаты статистического исследования спорадических возрастаний потоков электронов с энергией >30 кэВ на низких дрейфовых оболочках в зоне квазизахвата на геомагнитном экваторе. По данным низковысотных спутников NOAA/POES и MetOp был создан каталог событий с возрастаниями потоков квазизахваченных в запрещенной зоне электронов (forbidden energetic electrons, FEE) за 1998–2023 гг. Статистический анализ событий FEE выявил солнечно-циклическую, а также сезонную и суточную вариации в появлении возрастаний FEE. Исследована корреляция годовой частоты событий FEE с солнечной активностью, параметрами солнечного ветра и геомагнитной активностью. Обнаружены сильные корреляционные связи между событиями FEE и индексом F10.7 солнечной активности (поток радиоизлучения), а также с альфвеновским числом Маха MA (параметр солнечного ветра). Предложена интерпретация полученных результатов на основе механизма электрического дрейфа и радиального транспорта электронов из внутреннего радиационного пояса Земли в зону квазизахвата (L<1.2). Ключевым фактором действия механизма является эффективное проникновение электрического поля на низкие широты при возникновении значительной разницы проводимостей высокоширотной ионосферы в освещенном и неосвещенном секторах местного времени в условиях ослабления авроральной активности.

We present the results of a statistical study of transient enhancements of electrons with energies >30 keV at low drift shells in the quasi-trapped region (forbidden zone) at the geomagnetic equator. Using data from low-altitude NOAA/POES and MetOp satellites, we have compiled a catalog of events with forbidden energetic electron (FEE) enhancements for the period from 1998 to 2023. Statistical analysis of FEE events has revealed solar-cyclic, as well as seasonal and diurnal variations in the occurrence of FEE enhancements. We have examined the correlation of the annual frequency of FEE events with solar activity, solar wind parameters, and geomagnetic activity. Strong correlations have been found with the F10.7 index of solar activity (radio emission flux) as well as with the Alfvén Mach number (solar wind parameter). An interpretation of the obtained results is proposed which is based on the mechanism of electrical drift and radial transport of electrons from Earth’s inner radiation belt to the quasi-trapped region (L<1.2). The key factor for the operation of the mechanism is the effective penetration of the electric field to low latitudes when a significant difference in the conductivity of the high-latitude ionosphere occurs in the illuminated and unilluminated sectors of local time under conditions of weakening auroral activity.

 внутренний радиационный пояс квазизахваченные электроны солнечно-земные связи inner radiation belt quasi-trapped electrons solar-terrestrial relationships Работа выполнена в рамках темы НИР «Исследования Солнца, мониторинг и моделирование радиационной среды и плазменных процессов в гелиосфере и в околоземном космическом пространстве» The work was carried out under the research theme “Solar research, monitoring, and modeling of the radiation environment and plasma processes in the heliosphere and geospace”

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