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Solar activity influence on atmospheric erosion during the geomagnetic reversalтезисы доклада
- Авторы: Tsareva Olga, Levashov Nikolay, Cannell Alan, Malova Helmi, Zelenyi Lev
- Сборник: 44th COSPAR Scientific Assembly - COSPAR 2022, Athens, Greece, 16 - 24 July 2022
- Серия: Space Plasmas in the Solar System, including Planetary Magnetospheres (D), Magneto-plasma Structures, Streams and Flows in the Heliosphere (D1.2)
- Тезисы
- Год издания: 2022
- Место издания: COSPAR_2022 Греция, Афины
- Первая страница: C1.2-0000-22
- Последняя страница: C1.2-0000-22
- Номер статьи: 30024
- Аннотация: Solar parameters such as solar wind dynamic pressure and EUV radiations, (which are theprimary source for the ionosphere’s formation), significantly affect the atmospheric loss. Theseparameters depend on solar activity and the age of Sun. Since the magnetosphere protects theplanetary atmosphere from erosion by the solar wind, the question arises as to what will happento the atmosphere during the geomagnetic reversal, when the dipole component weakens. Forquiet periods of solar activity, the dependence of ion escape rates on the configuration andstrength of the geomagnetic field showed that, during reversal, magnetic shielding still effectively protects the atmosphere from sputtering and pickup of ions, but contributes to polar and auroral winds from polar caps and cusps. However, paleodata indicate an increase in isotope ratios with an increase in the reversal rates during the Phanerozoic eon that, according toestimates of the efficiency of isotope fractionation by each escape mechanism, may be due to the atmospheric loss by solar wind-driven escape. This work is supported by the grant MK-5053.2022.6 of the Ministry of Science and HigherEducation of the Russian Federation.
- Добавил в систему: Малова Хельми Витальевна