naa a22 4500 510732011 CHVBK 20180411082956.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1134/S1063772913050065 doi (NATIONALLICENCE)springer-10.1134/S1063772913050065 Fluctuations in the alpha-effect and grand solar minima [Elektronische Daten] [S. Olemskoy, A. Choudhuri, L. Kitchatinov] The parameters of a special type of α-effect known in dynamo theory as the Babcock-Leighton mechanism are estimated using the data of sunspot catalogs. The estimates support the presence of the Babcock-Leighton α-effect on the Sun. Fluctuations of the α-effect are also estimated. The fluctuation amplitude appreciably exceeds themean 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 numericalmodel 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. Pleiades Publishing, Ltd., 2013 Olemskoy S. Institute of Solar-Terrestrial Physics, Siberian Division of the Russian Academy of Sciences, ul. Lermontova 126a, 664033, Irkutsk, Russia aut Choudhuri A. Department of Physics, Indian Institute of Science, 560012, Bangalore, India aut Kitchatinov L. Institute of Solar-Terrestrial Physics, Siberian Division of the Russian Academy of Sciences, ul. Lermontova 126a, 664033, Irkutsk, Russia aut Astronomy Reports SP MAIK Nauka/Interperiodica 57/6(2013-06-01), 458-468 1063-7729 57:6<458 2013 57 11444 https://doi.org/10.1134/S1063772913050065 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063772913050065 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Olemskoy S. Institute of Solar-Terrestrial Physics, Siberian Division of the Russian Academy of Sciences, ul. Lermontova 126a, 664033, Irkutsk, Russia aut NATIONALLICENCE 700 1- Choudhuri A. Department of Physics, Indian Institute of Science, 560012, Bangalore, India aut NATIONALLICENCE 700 1- Kitchatinov L. Institute of Solar-Terrestrial Physics, Siberian Division of the Russian Academy of Sciences, ul. Lermontova 126a, 664033, Irkutsk, Russia aut NATIONALLICENCE 773 0- Astronomy Reports SP MAIK Nauka/Interperiodica 57/6(2013-06-01), 458-468 1063-7729 57:6<458 2013 57 11444 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer