Relationship between geomagnetic thresholds of galactic cosmic rays and heliospheric parameters during the May 10–12, 2024 storm

Данилова Ольга Александровна; Сдобнов Валерий Евгеньевич

doi:10.12737/stp-123202608

УДК 523.62 УДК 523.9

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RELATIONSHIP BETWEEN GEOMAGNETIC THRESHOLDS OF GALACTIC COSMIC RAYS AND HELIOSPHERIC PARAMETERS DURING THE MAY 10–12, 2024 STORM Relationship between geomagnetic thresholds of galactic cosmic rays and heliospheric parameters during the May 10–12, 2024 storm

АА Аа

Опубликовано в Solar-Terrestrial Physics · Том 12, Номер 3 · Страницы 72–80 · Рубрика: Results of current research

DOI: https://doi.org/10.12737/stp-123202608 · EDN: GTKMNM

Получено: 10.02.2026 Одобрено: 30.04.2026 Опубликовано: 19.09.2026 Язык публикаций: ENG

Авторы

ДА

Данилова Ольга Александровна

СД

Сдобнов Валерий Евгеньевич

ДА

Данилова Ольга Александровна

Ученая степень: кандидат физико-математических наук

Санкт-Петербургский филиал Института земного магнетизма, ионосферы и распространения радиоволн им. Н.В. Пушкова РАН Россия · Санкт-Петербург

СД

Сдобнов Валерий Евгеньевич

Ученая степень: кандидат физико-математических наук

Институт солнечно-земной физики СО РАН Ведущий научный сотрудник · Россия · Иркутск

АННОТАЦИЯ

Galactic cosmic rays (CRs) are charged energetic particle fluxes that penetrate interplanetary space. Under the influence of the geomagnetic field, charged cosmic ray particles change their trajectories. Some of these particles, with rigidity below the threshold value characteristic of the measurement site (called the geomagnetic cutoff rigidity, or geomagnetic threshold, R), do not reach the Earth surface. In this study, geomagnetic thresholds R as well as their changes relative to quiet conditions (ΔR) for six stations at different latitudes have been calculated using two methods: 1) a method in which cosmic ray particle trajectories are calculated numerically in a model magnetic field of the magnetosphere (Reff); 2) a spectrographic global survey based on observational data from cosmic ray recordings by a global network of stations (Rsgs) during a very strong magnetic storm on May 10–12, 2024. The obtained results were compared. It was found that the changes in cosmic ray geomagnetic thresholds for this storm, calculated by both methods, correlate well with each other. The most geoeffective components are the vertical component of the interplanetary magnetic field Bz and its full scalar value B, whereas the By component of the field has virtually no effect on changes in threshold rigidities for all stations. ΔR also correlates well with the geomagnetic indices Dst and Kp, with the electric field parameter Ey, and with the solar wind's dynamic parameters (density and pressure), while no significant correlation is observed with solar wind speed. Analysis has shown that the response of ΔR to the controlling electromagnetic parameters and geomagnetic activity indices remains virtually unchanged with the latitude of the observation station for the given storm.

КЛЮЧЕВЫЕ СЛОВА

cosmic rays, geomagnetic threshold, cosmic ray cutoff rigidity, interplanetary magnetic field, geomagnetic activity

Финансирование

The work was financially supported partly by the Ministry of Science and Higher Education of the Russian Federation (Subsidy No. 075-GZ/Ts3569/278)

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Жеребцов Гелий Александрович

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ГОСТ

Данилова О. А., Сдобнов В. Е. Relationship between geomagnetic thresholds of galactic cosmic rays and heliospheric parameters during the May 10–12, 2024 storm // Solar-Terrestrial Physics. 2026. № 3. С. 72-80. DOI: https://doi.org/10.12737/stp-123202608. EDN: GTKMNM. (дата обращения: 24.10.2026).

MLA

Данилова Ольга Александровна, Сдобнов В. Е.. "Relationship between geomagnetic thresholds of galactic cosmic rays and heliospheric parameters during the May 10–12, 2024 storm." Solar-Terrestrial Physics 12.3 (2026): 72-80. DOI: https://doi.org/10.12737/stp-123202608. EDN: GTKMNM.

APA

Данилова О. А., Сдобнов В. Е. (2026). Relationship between geomagnetic thresholds of galactic cosmic rays and heliospheric parameters during the May 10–12, 2024 storm. Solar-Terrestrial Physics, 12(3), 72-80. https://doi.org/10.12737/stp-123202608 EDN: GTKMNM.

Chicago

Данилова Ольга Александровна, Сдобнов В. Е.. "Relationship between geomagnetic thresholds of galactic cosmic rays and heliospheric parameters during the May 10–12, 2024 storm." Solar-Terrestrial Physics 12, no. 3 (2026): 72-80. https://doi.org/10.12737/stp-123202608. EDN: GTKMNM.

WIKI

{{cite journal | author = Данилова О. А., Сдобнов В. Е. | title = Relationship between geomagnetic thresholds of galactic cosmic rays and heliospheric parameters during the May 10–12, 2024 storm | journal = Solar-Terrestrial Physics | year = 2026 | volume = 12 | issue = 3 | pages = 72-80 | doi = 10.12737/stp-123202608 }} EDN: GTKMNM

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RELATIONSHIP BETWEEN GEOMAGNETIC THRESHOLDS OF GALACTIC COSMIC RAYS AND HELIOSPHERIC PARAMETERS DURING THE MAY 10–12, 2024 STORM Relationship between geomagnetic thresholds of galactic cosmic rays and heliospheric parameters during the May 10–12, 2024 storm

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