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Different mechanisms of the electron acceleration up to relativistic energies and Arase and GOES satellite observationsтезисы доклада
- Авторы: Belakhovsky V.B., Pilipenko V.A., Antonova E.E., Miyosh Y.
- Сборник: The 45th annual seminar "Physics of auroral phenomena", Abstracts
- Тезисы
- Год издания: 2022
- Место издания: Polar Geophysical Institute Apatity
- Первая страница: 27
- Последняя страница: 27
- Аннотация: We study the role of different mechanisms suggested for the explanation of the processes of the outer radiation belt formation and evolution. ULF mechanism simultaneously with radial diffusion by sudden impulses was suggested as one of the first. It supports the radial diffusion transport described by the Fokker-Planck equation leading the increase of particle energy due to betatron acceleration. Such mechanism qualitatively reproduced the long-term flux variations observed in the inner portion of the outer belt and the slot region. However, it has difficulties with the explanation of the inner magnetosphere acceleration of relativistic electrons and the formation of the phase space density maximum at definite radial distance. The variations of relativistic electron fluxes and wave activity in the work are studied using the data of the geostationary satellites GOES and the Japanese satellite Arase (ERG). For the describing VLF wave activity in the magnetosphere the PWE instrument on Arase satellite we used. The magnetosphere ULF wave activity in the Pc5 frequency range was described by the ULF index developed at the IPE RAS. Cases without magnetic storms with high solar wind speed and magnetic storms are selected. For the selected events the growth of VLF and ULF wave activity was registered approximately at the same time and coincides with the growth of substorm activity. Therefore, it is not easy to separate the contribution of these acceleration mechanisms. We analyzed strong magnetic storms when the flux intensity maximum shifts to lower L-shells compared to intervals without magnetic storms. We verify the validity of the Tverskaya relation, which connect the minimum during storm Dst/Sym-H variation with the position of the radiation belt maximum after storm and analyze the action of ULF mechanism in the outer radiation belt particle dynamics.
- Добавил в систему: Антонова Елизавета Евгеньевна