Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 103585 10.12737/stp-113202505 20TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 10–14, 2025, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA 20TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 10–14, 2025, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA 20TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 10–14, 2025, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA Geomagnetic cutoff of cosmic rays during the March 23–24, 2023 magnetic storm: Relationship with solar wind parameters and geomagnetic activity taking into account latitudinal effects Geomagnetic cutoff of cosmic rays during the March 23–24, 2023 magnetic storm: Relationship with solar wind parameters and geomagnetic activity taking into account latitudinal effects Данилова Ольга Александровна Danilova Olga Aleksandrovna md1555@mail.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Птицына Наталья Григорьевна Ptitsyna Natalia Grigoryevna nataliaptitsyna@yandex.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Сдобнов Валерий Евгеньевич Sdobnov Valeriy Evgen'evich sdobnov@iszf.irk.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Санкт-Петербургский филиал Института земного магнетизма, ионосферы и распространения радиоволн РАН Санкт-Петербург Россия St.-Petersburg Filial of IZMIRAN Saint Petersburg Russian Federation Санкт-Петербургский филиал Института земного магнетизма, ионосферы и распространения радиоволн РАН Санкт-Петербург Россия St.-Petersburg Filial of IZMIRAN Saint Petersburg Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation 22 09 2025 22 09 2025 11 3 37 43 10 03 2025 30 05 2025 https://zh-szf.ru/en/nauka/article/103585/view

In this paper, we calculate geomagnetic cutoff rigidities during the strong magnetic storm of March 23–24, 2023, using 1) the spectrographic global survey method based on observational data from cosmic ray recording by the global network of stations (Rsgs); 2) numerical trajectory calculations in a model magnetic field of the magnetosphere (Reff). The geomagnetic cutoff rigidity has been determined for nine cosmic ray stations at different latitudes. We calculated the correlations of the variations in the geomagnetic cutoff rigidity ΔRsgs and ΔReff with magnetic and dynamic solar wind parameters and the geomagnetic activity indices Dst and Kp. It has been found that the geomagnetic cutoff rigidity calculated by both methods correlate most strongly with Dst and the electromagnetic parameters of the solar wind. No significant correlation with the dynamic parameters was observed. The analysis has shown that the response of ΔRsgs to the controlling magnetic parameters and Dst changes with latitude of the observation station: the correlation reaches its highest values at midlatitudes and drops significantly toward the equator. The correlations of ΔReff calculated by the model do not reveal a latitudinal dependence.

In this paper, we calculate geomagnetic cutoff rigidities during the strong magnetic storm of March 23–24, 2023, using 1) the spectrographic global survey method based on observational data from cosmic ray recording by the global network of stations (Rsgs); 2) numerical trajectory calculations in a model magnetic field of the magnetosphere (Reff). The geomagnetic cutoff rigidity has been determined for nine cosmic ray stations at different latitudes. We calculated the correlations of the variations in the geomagnetic cutoff rigidity ΔRsgs and ΔReff with magnetic and dynamic solar wind parameters and the geomagnetic activity indices Dst and Kp. It has been found that the geomagnetic cutoff rigidity calculated by both methods correlate most strongly with Dst and the electromagnetic parameters of the solar wind. No significant correlation with the dynamic parameters was observed. The analysis has shown that the response of ΔRsgs to the controlling magnetic parameters and Dst changes with latitude of the observation station: the correlation reaches its highest values at midlatitudes and drops significantly toward the equator. The correlations of ΔReff calculated by the model do not reveal a latitudinal dependence.

 cosmic rays geomagnetic threshold cosmic ray cutoff rigidity interplanetary magnetic field geomagnetic activity cosmic rays geomagnetic threshold cosmic ray cutoff rigidity interplanetary magnetic field geomagnetic activity The work was partially carried out with the financial support from the Ministry of Science and Higher Education of the Russian Federation (Subsidy No. 075-GZ/Ts3569/278) The work was partially carried out with the financial support from the Ministry of Science and Higher Education of the Russian Federation (Subsidy No. 075-GZ/Ts3569/278)

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