|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ЦЭМИ РАН |
||
Atmospheric escape of N2 and O2 during paleomagnetic reversalsтезисы доклада
- Авторы: Tsareva Olga, Nikolay Levashov, Cannell Alan, Malova Helmi, Zelenyi Lev
- Сборник: 44th COSPAR Scientific Assembly - COSPAR 2022, Athens, Greece, 16 - 24 July 2022, Book of abstracts
- Серия: COSPAR-2022 C: Space Studies of the Upper Atmospheres of the Earth and Planets including Reference Atmospheres, C1.5: Space Weather and Earth's Atmosphere-Ionosphere
- Тезисы
- Год издания: 2022
- Место издания: COSPAR COSPAR Scientific Assembly Афины Fabys, Uhtwbz
- Первая страница: C1.5-0000-22
- Последняя страница: C1.5-0000-22
- Номер статьи: 30008
- Аннотация: question arises as to what will happen to the atmosphere during the geomagnetic reversal, when the dipole component weakens. For an answer, atmospheric erosion models were generalized to the case of a dipolar-quadrupolar magnetosphere. The dependence of ion escape rates on the configuration and strength 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. This conclusion is valid for quiet periods of solar activity. However, the geomagnetic reversal duration covers several thousand years, during which many extreme events occur, that require the model to take into account changes in solar wind pressure and EUV radiation, as the source of ion production. In addition to solar activity, these parameters also depend on the age of Sun, which is important for paleomagnetic reversals. Paleodata indicate an increase in isotope ratios 18O and 15N with an increase in the reversal rates during the Phanerozoic eon that, according to estimates 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 Higher Education of the Russian Federation.
- Добавил в систему: Малова Хельми Витальевна