Physics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..127..393f&link_type=abstract
(Sun in Time Conference, Tucson, AZ, Mar. 6-10, 1989) Solar Physics (ISSN 0038-0938), vol. 127, June 1990, p. 393-403.
Physics
47
Auroras, Chaos, Dynamo Theory, Periodic Variations, Solar Activity, Solar Cycles, Chronology, Minima, Phase Shift, Sunspots
Scientific paper
The problem of whether the solar dynamo is quasi-periodic or chaotic is addressed by examining 1500 years of sunspot, geomagnetic, and auroral activity cycles. Sub-harmonics were found of the fundamental solar cycle period during the years preceding the Maunder minimum and loss of phase of the subharmonic on emergence from it. These phenomena are indicative of chaos. They indicate that the solar dynamo is chaotic and is operating in a region close to the transition between period doubling and chaos. Since Maunder-type minima reoccur irregularly for millennia, it appears that the sun remains close to this transition to and from chaos. This is postulated to be a universal characteristic of solar type stars caused by feedback in the dynamo number.
Feynman Joan
Gabriel Stephen B.
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