Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 64149 10.12737/stp-93202313 18TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 6–10, 2023, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA 18TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 6–10, 2023, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA 18TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 6–10, 2023, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA Relation between the area of polar coronal holes and the solar wind speed at a minimum between solar cycles 22 and 23 Relation between the area of polar coronal holes and the solar wind speed at a minimum between solar cycles 22 and 23 Борисенко Алексей Васильевич Borisenko Aleksey Vasilevich sunw77@mail.ru https://orcid.org/0000-0002-5448-8959 Богачев Сергей Александрович Bogachev Sergey Aleksandrovich bogachev.sergey@gmail.com

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Физический институт имени П.Н. Лебедева Российской академии наук Lebedev Physical Institute of the Russian Academy of Sciences Институт космических исследований РАН Москва Россия Space Research Institute of RAS Moscow Russian Federation Самарский национальный исследовательский университет им. академика С.П. Королева Самара Россия Samara National Research University Samara Russian Federation 30 09 2023 30 09 2023 9 3 112 117 01 05 2023 18 06 2023 https://naukaru.ru/en/nauka/article/64149/view

We have used data from the space telescope SOHO/EIT and the spectrometer VEIS on the Wind spacecraft to compare the solar wind (SW) speed near Earth's orbit with changes in the area of polar coronal holes (CHs) on the Sun during the 1996 solar activity minimum. We have found that in March 1996 the SW speed correlated with the southern CH area by a factor of 0.64. In September and October 1996, a correlation was revealed between the SW speed and the area of the northern CH (the coefficients are 0.64 and 0.85 respectively). We believe that this confirms the assumption that the solar wind from polar CHs can penetrate into the ecliptic plane at solar minimum. The SW speed was 460–500 km/s, which is lower than that from equatorial CHs (600–700 km/s).

We have used data from the space telescope SOHO/EIT and the spectrometer VEIS on the Wind spacecraft to compare the solar wind (SW) speed near Earth's orbit with changes in the area of polar coronal holes (CHs) on the Sun during the 1996 solar activity minimum. We have found that in March 1996 the SW speed correlated with the southern CH area by a factor of 0.64. In September and October 1996, a correlation was revealed between the SW speed and the area of the northern CH (the coefficients are 0.64 and 0.85 respectively). We believe that this confirms the assumption that the solar wind from polar CHs can penetrate into the ecliptic plane at solar minimum. The SW speed was 460–500 km/s, which is lower than that from equatorial CHs (600–700 km/s).

 coronal holes solar wind solar cycle coronal holes solar wind solar cycle The work was financially supported by the Russian Science Foundation (Grant No. 23-72-30002, [https://rscf.ru /project/23-72-30002/] The work was financially supported by the Russian Science Foundation (Grant No. 23-72-30002, [https://rscf.ru /project/23-72-30002/]

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