Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 82247 10.12737/stp-103202413 19TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 5–9, 2024, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA 19TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 5–9, 2024, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA 19TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 5–9, 2024, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA Comparison of modeling of the polar cap absorption effect with observations at the AARI ground-based network Comparison of modeling of the polar cap absorption effect with observations at the AARI ground-based network Дмитриев Алексей Владимирович Dmitriev Alexei Vladimirovich dalex@jupiter.ss.ncu.edu.tw https://orcid.org/0000-0003-3661-4197 Долгачева Светлана Александровна Dolgacheva Svetlana Aleksandrovna dolgachyova2010@yandex.ru Трошичев Олег Александрович Troshichev Oleg Aleksandrovich olegtro@aari.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Пулинец Мария Сергеевна Pulinets Maria Sergeevna cotopaxy@gmail.com 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 Арктический и антарктический научно-исследовательский институт Санкт-Петербург Россия Arctic and Antarctic Research Institute St. Petersburg Russian Federation Арктический и антарктический научно-исследовательский институт Санкт-Петербург Россия Arctic and Antarctic Research Institute St. Petersburg Russian Federation Научно-исследовательский институт ядерной физики им. Д.В. Скобельцина МГУ им. М.В. Ломоносова Москва Россия Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University Moscow Russian Federation 29 09 2024 29 09 2024 10 3 108 120 19 04 2024 21 06 2024 https://zh-szf.ru/en/nauka/article/82247/view

An elliptical model of cutoff for solar cosmic rays (SCR) at high latitudes has been calculated for SCR events and geomagnetic storms that occurred in February, March, and September 2014, June 2015, and September 2017 in order to predict the polar cap absorption (PCA) effect. The prediction is compared with observations of the PCA effect at the AARI network of six ionosondes, located in the north of Russia in a wide range of longitudes from 30 to 170 and magnetic latitudes from 56 to 64. We examine the dependence of the cutoff latitude on the magnetic storm strength, as well as the effect of additional ionization of the dayside and nightside ionosphere by SCR protons and electrons. The model demonstrates a satisfactory statistical accuracy up to 0.83 for the PCA prediction. We discuss prospects for further improvement of the elliptical model, such as consideration of the impact of SCRs of higher energies and inclusion of the PC index of energy flux into the polar cap.

An elliptical model of cutoff for solar cosmic rays (SCR) at high latitudes has been calculated for SCR events and geomagnetic storms that occurred in February, March, and September 2014, June 2015, and September 2017 in order to predict the polar cap absorption (PCA) effect. The prediction is compared with observations of the PCA effect at the AARI network of six ionosondes, located in the north of Russia in a wide range of longitudes from 30 to 170 and magnetic latitudes from 56 to 64. We examine the dependence of the cutoff latitude on the magnetic storm strength, as well as the effect of additional ionization of the dayside and nightside ionosphere by SCR protons and electrons. The model demonstrates a satisfactory statistical accuracy up to 0.83 for the PCA prediction. We discuss prospects for further improvement of the elliptical model, such as consideration of the impact of SCRs of higher energies and inclusion of the PC index of energy flux into the polar cap.

 solar cosmic rays geomagnetic cutoff high-latitude ionosphere ionosondes polar cap absorption solar cosmic rays geomagnetic cutoff high-latitude ionosphere ionosondes polar cap absorption

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