The Solar Dynamo and Its Phase Transitions during the Last Millennium
We analyze the variation of the solar-dynamo magnetic-field components during the last millennium through a study of their proxy data. We introduce a phase diagram with as abscissa and ordinate the proxies of the values of the toroidal and poloidal magnetic field components. In this diagram the dynamo system appears to regularly cross a well-defined point, which we call the Transition Point. Such crossings occurred five times during the past millennium. Each of these crossings preceded a Grand Episode, either a Minimum or a Maximum one. In addition to these two types of quasiperiodic behavior, a third type consisting of weaker quasiregular oscillations (R) around the Transition Point’s coordinates is identified. These periods appear to last one or two times the Gleissberg cycle length. Between the various types of episodes there are brief phase transitions. We identify two types of such phase transitions.
KeywordsSolar Phys Sunspot Number Maunder Minimum Solar Dynamo Grand Minimum
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- Ogurtsov, M.G.: 2004, In: Stepanov, A.V., Benevolenskaya, E.E., Kosovichev, A.G. (eds.) Multi-Wavelength Investigations of Solar Activity, Proc. IAU Symposium 223, Cambridge University Press, Cambridge, 135. Google Scholar
- Scherer, K., Fichtner, H., Borrmann, T., Beer, J., Desorgher, L., Flükiger, E., Fhar, H.J., Ferreira, S.E.S., Langner, U.W., Potgieter, M.S., Heber, B., Masarik, J., Shaviv, N.J., Veizer, J.: 2006, Space Sci. Rev. 127, 467. Google Scholar
- Weiss, N.O.: 1987, In: Stephenson, F.R., Wolfendale, A.W. (eds.) Secular Solar and Geomagnetic Variations in the Last 10 000 Years, University of New Hampshire, Durham, 69. Google Scholar