Fluctuations in the Alpha-Effect and Grand Solar Minima

Дата и время публикации : 2013-05-13T02:53:45Z

Авторы публикации и институты :
S. V. Olemskoy
A. R. Choudhuri
L. L. Kitchatinov

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: To appear in Astronomy Reports, 20 pages, 9 figures
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR

Краткий обзор статьи: Parameters of a special kind of alpha-effect known in dynamo theory as the Babcock-Leighton mechanism are estimated using the data of sunspot catalogs. The estimates evidence the presence of the Babcock-Leighton alpha-effect on the Sun. Fluctuations of the alpha-effect are also estimated. The fluctuation amplitude appreciably exceeds the mean value, and the characteristic time for the fluctuations is comparable to the period of the solar rotation. Fluctuations with the parameters found are included in a numerical model for the solar dynamo. Computations show irregular changes in the amplitudes of the magnetic cycles on time scales of centuries and millennia. The calculated statistical characteristics of the grand solar minima and maxima agree with the data on solar activity over the Holocene.

Category: Physics