Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 57072 10.12737/stp-93202302 Results of current research Results of current research Results of current research Role of alpha particles in penetration of solar wind diamagnetic structures into the magnetosphere Role of alpha particles in penetration of solar wind diamagnetic structures into the magnetosphere Еселевич Виктор Григорьевич Eselevich Viktor Grigoryevich esel@iszf.irk.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Пархомов Владимир Александрович Parhomov Vladimir Aleksandrovich pekines_41@mail.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation Байкальский государственный университет Иркутск Россия Baikal state university Irkutsk Russian Federation 30 09 2023 30 09 2023 9 3 10 20 05 02 2023 12 05 2023 https://naukaru.ru/en/nauka/article/57072/view

We present the results of studies showing the presence of simultaneous jumps in the density of protons (N2/N1)p and alpha particles (N2/N1)α at the boundaries of diamagnetic structures (DS) of various types both in the quasi-stationary slow solar wind (SW) and in sporadic SW. For DS of quasi-stationary slow SW, associated with streamer belt or chains, in the statistics considered in the paper there is a single linear dependence of (N2/N1)α on (N2/N1)p. This means that these jumps have the same physical nature and are related to diamagnetism at the boundaries of DS of quasi-stationary SW streams of various types. At the front of interplanetary shock waves (ISW), the (N2/N1)α jump is approximately twice as large as the (N2/N1)p jump. This reflects the features of the collective collisionless plasma heating at ISW fronts and requires further studies. A maximum excess (almost 3 times) of the increase in the alpha-particle density (N2/N1)α over the increase in the proton density (N2/N1)p is observed in eruptive prominences. The magnetospheric response in such phenomena as auroras, proton and alpha particle fluxes, geomagnetic field, and geomagnetic pulsations is similar under the influence of DS of various types and ISW. The detected features of the magnetospheric response to the contact with DS of different types and ISW can be interpreted as impulsive passage of the DS matter (plasmoid) into the magnetosphere. The results of studies of the (N2/N1)α jumps can be used as an additional important argument in identifying cases of impulsive penetration of DS into the magnetosphere and in examining the physical nature of these penetrations.

We present the results of studies showing the presence of simultaneous jumps in the density of protons (N2/N1)p and alpha particles (N2/N1)α at the boundaries of diamagnetic structures (DS) of various types both in the quasi-stationary slow solar wind (SW) and in sporadic SW. For DS of quasi-stationary slow SW, associated with streamer belt or chains, in the statistics considered in the paper there is a single linear dependence of (N2/N1)α on (N2/N1)p. This means that these jumps have the same physical nature and are related to diamagnetism at the boundaries of DS of quasi-stationary SW streams of various types. At the front of interplanetary shock waves (ISW), the (N2/N1)α jump is approximately twice as large as the (N2/N1)p jump. This reflects the features of the collective collisionless plasma heating at ISW fronts and requires further studies. A maximum excess (almost 3 times) of the increase in the alpha-particle density (N2/N1)α over the increase in the proton density (N2/N1)p is observed in eruptive prominences. The magnetospheric response in such phenomena as auroras, proton and alpha particle fluxes, geomagnetic field, and geomagnetic pulsations is similar under the influence of DS of various types and ISW. The detected features of the magnetospheric response to the contact with DS of different types and ISW can be interpreted as impulsive passage of the DS matter (plasmoid) into the magnetosphere. The results of studies of the (N2/N1)α jumps can be used as an additional important argument in identifying cases of impulsive penetration of DS into the magnetosphere and in examining the physical nature of these penetrations.

 slow solar wind sporadic solar wind ratio of alpha particles to protons magnetospheric response to DS and ISW slow solar wind sporadic solar wind ratio of alpha particles to protons magnetospheric response to DS and ISW The work was performed with financial support from the Ministry of Science and Higher Education of the Russian Federation (V.G. Eselevich — Basic Research Program II.16) and as part of the state-funded research topic of BSU for 2021–2022 "System analysis and methods of information processing" (V.A. Parkhomov) The work was performed with financial support from the Ministry of Science and Higher Education of the Russian Federation (V.G. Eselevich — Basic Research Program II.16) and as part of the state-funded research topic of BSU for 2021–2022 "System analysis and methods of information processing" (V.A. Parkhomov)

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