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SUMMARY:Rieger\, Schwabe\, Suess-de Vries: The sunny beats of resonance
DTSTART:20241001T130000Z
DTEND:20241001T140000Z
DTSTAMP:20260613T182000Z
UID:indico-event-8898@indico.fysik.su.se
DESCRIPTION:Speakers: Frank Stefani (Helmholtz-Zentrum Dresden - Rossendor
 f)\n\nhttps://stockholmuniversity.zoom.us/j/940229961\n \n\nIn the first 
 part of the talk\, we discuss a model of the solar dynamo that tries to ex
 plain its various periodicities on widely different time scales in a self-
 consistent manner. Starting with Rieger-type periods\, we show that the tw
 o-planet spring-tides of Venus\, Earth and Jupiter can excite magneto-Ross
 by waves in the solar tachocline with periods between 100 and 300 days and
  amplitudes of m/s or even more. We further show that the dynamo-relevant 
 quadratic action of these waves contains a beat period of 11.07 years\, an
 d that its axisymmetric part might indeed be strong enough to synchronize 
 the entire solar dynamo via parametric resonance. Then we argue that a sec
 ond beat between the arising Hale cycle and the 19.86-year periodic motion
  of the Sun around the barycenter of the solar system may explain the long
 er-term Gleissberg and Suess-de Vries cycles. The spectrum emerging from t
 his double-synchronized dynamo model shows amazing correspondence with cli
 mate-related data.\nIn the second (and shorter) part of the talk\, we exam
 ine the present status of the DRESDYN precession-driven dynamo experiment.
  One of its motivations stems from the poorly understood spin-orbit coupli
 ng effect in our solar dynamo model. We discuss the combined numerical and
  experimental efforts to identify dynamo-optimizing precession ratios and 
 nutation angles\, and illustrate the steps in the construction of the mach
 ine that is presently under commissioning.\n\n\nhttps://indico.fysik.su.se
 /event/8898/
URL:https://indico.fysik.su.se/event/8898/
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