Evolution of the magnetic field reversals in galaxiesстатья
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Дата последнего поиска статьи во внешних источниках: 12 сентября 2019 г.
Авторы:
Mikhailov E. ,
Khasaeva T.
Журнал:
Bulgarian Astronomical Journal
Том:
31
Год издания:
2019
Издательство:
Institute of Astronomy and Rozhen NAO
Местоположение издательства:
Sofia, Bulgaria
Первая страница:
39
Последняя страница:
50
Аннотация:
Some of the galaxies have regular magnetic fields which are generated by the dynamo mechanism. It is based on joint action of differential rotation and alpha-effect. For some objects it is possible to have the field reversal, when it has opposite directions in different regions of galaxy. The reversals can be described by the nonlinear equations of the galaxy dynamo theory. We have studied this process using no-z approximation for the magnetic field. At first we took the simple one-dimensional model, which allows us make some asymptotic estimates. Some analytical expressions for small values of the turbulent diffusivity coefficient are given. After that we model the field numerically, and describe the reversal evolution for realistic values of parameters. According to all these approaches, the reversal can be generated during the first period of the magnetic field evolution. After that the reversal moves with some velocity of order of 1 km/s. В© 2019, Institute of Astronomy and Rozhen NAO. All rights reserved.
Добавил в систему:
Михайлов Евгений Александрович