|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ЦЭМИ РАН |
||
Analysis of the contribution of different mechanisms to the electron acceleration up to the relativistic energies using Arase and GOES satellite dataтезисы доклада
- Авторы: Belakhovsky V., Shiokawa K., Kasahara Y., Higashio N., Antonova E., Miyoshi Y., Kasahara S., Matsuda S., Pilipenko V.
- Сборник: Abstracts of 44th COSPAR Scientific Assembly, 16 July - 24 July 2022, Athens, Greece
- Тезисы
- Год издания: 2022
- Место издания: Athens, Greece Greece
- Первая страница: D3.4-0005-22
- Последняя страница: D3.4-0005-22
- Аннотация: The identification of the main mechanisms of electron acceleration to relativistic energies (several MeV) in the outer radiation belt of the Earth is still one of the main problems of magnetosphere physics. In this work, variations of relativistic electron fluxes and wave activity are studied to determine the contribution of each of the proposed acceleration mechanisms. Variations of ULF and VLF wave disturbances are analyzed. The registration of electron fluxes was carried out according to the data of the geostationary satellites GOES and the Japanese satellite Arase (ERG). To characterize VLF wave activity in the magnetosphere, we used data from the Arase satellite (PWE instrument). The ULF index developed at the IPE RAS was used to characterize the wave activity of the magnetosphere in the Pc5 range. Cases without magnetic storms with high solar wind speed and intervals with magnetic storms are investigated. It is considered mostly strong geomagnetic storms during the satellite era – 27-29 May 2017, 7-10 September 2017, 25-28 August 2018. The main feature of the action of various acceleration mechanisms is the growth of relativistic electron fluxes by 1.5-2 orders of magnitude 1-3 days after the growth of the ULF index, the growth of the power of VLF radiation. The analysis shows that the growth of VLF and ULF wave activity occurs 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. It is shown that in the considered events, the values of relativistic electron fluxes during magnetic storms (with an average solar wind speed) are greater than for intervals without magnetic storms with a high solar wind speed, which may indicate about the action of the ULF acceleration mechanism without magnetic storms. During magnetic storms, the flux intensity maximum shifts to lower L-shells compared to intervals without magnetic storms. Its position corresponds well to the Tverskaya relation, and the acceleration mechanism associated with the injection of electrons into the region of the magnetic field weakened by the ring current and their subsequent adiabatic acceleration during the restoration of the magnetic field can work effectively. The advantages and disadvantages of various acceleration mechanisms are discussed. The study was supported by a grant from the Russian Science Foundation #18-77-10018.
- Добавил в систему: Антонова Елизавета Евгеньевна