Solar Cycle Induced by Rotating Medium.

Bart Leplae has a new paper published in the General Science Journal that proposes a new method of spin orbit coupling that could be responsible for rotation changes at the Sun. Bart outlines a few principles in his introduction.

• Scientific Publication: “Does a Spin–Orbit Coupling Between
the Sun and the Jovian Planets Govern the Solar Cycle?”
(I. R. G. Wilson, B. D. Carter, and I. A. Waite, 2007):
– Presents evidence to show that changes in the Sun’s equatorial
rotation rate are synchronized with changes in its orbital motion
about the barycentre of the Solar System
– Proposes that this synchronization is indicative of a spin–orbit
coupling mechanism operating between the Jovian planets and
the Sun
– While data are consistent with the idea that there is a spin–orbit
coupling between Jupiter and the Sun, it does not tell anything
about the true nature of the underlying mechanism that might
be causing this coupling
• This paper proposes the Rotating Medium Model as the
underlying mechanism for the Spin-Orbit Coupling.

A link for the paper can be found at

The paper does not explain how planetary alignment might affect solar rotation rates during solar grand minima but other points might be of interest to readers. Comments and discussion is encouraged.

6 comments on “Solar Cycle Induced by Rotating Medium.

  1. I created a follow-up paper, “Solar Cycle induced through Coriolis Effect” which can be found at:

    Click to access 4451_leplae5.pdf

    This paper correlates two sources of information:
    – Velocity of the Sun since 1750 (exported from GravitySimulator tool)
    – Sun spot information from SIDC -Solar Influences Data Analysis Center

    The annotations on the correlation graphs explain how the Sunspot cycle is linked with the Velocity of the Sun (including the Solar Cycles during solar grand minima).

    In addition, the model shows that the decrease of the Sun Spot activity is slowed down after the Solar Velocity decreases/increases. An example of this event occured in 1792-1793 and is described in:

    Click to access apjl_700_2_154.pdf

    Following the ‘logic’ of the proposed model, the current solar cycle will be at its maximum by the end of 2012. (the moment at which the solar velocity will be at a minimum and start te increase again)

    • Thanks Bart for your contribution. Personally I do not agree with your model, the solar cycles simply do not stay in sync with any of the barycentric movements of the Sun. But good luck with the future.

  2. I agree that there is no exact synchronisation, between 1754 and 2005 as there have been:
    – 25 accelerations/decelarations of the Solar velocity
    – 23 solar cycles

    The ‘missing’ 2 solar cycles:
    – 1804-1811: Solar activity did not reach minimum before Solar Velocity minimum in 1812
    – 1883-1890: Solar activity did not reach minimum before Solar Velocity minimum in 1891

    What seems to play a role as well:
    – 1800-1802: Only 2.5 years increase of Solar activity until reaching max. Velocity in 1802
    – 1879-1882: Only 3 years increase of Solar activity until reaching max. Velocity in 1882

    Both these events correlate with the occurance of solar grand minima.

    Future plans are to translate the logic explained the paper into a model …

  3. Created the follow-up publication:

    This paper covers several correlations between variations of the Sun Velocity (as influenced by the relative positions of the planets) and different aspects of the Solar Cycle, including: the Sun Spot Cycle, Polar Magnetic Field and Hemispheric Phase differences.

    The correlations indicate that the Polar Magnetic Field and the magnitude of N/S Hemispheric Phase differences correlate with the 20 year synodic period of Jupiter and Saturn.

  4. Thanks Bart for your update. The changes in velocity occur at the same time as the Angular Momentum Perturbation shown on Carl’s Graph at the green arrows so we are working in the same direction. The change comes about usually from the inner loop change forcing the circle wider around the SSB and a reduction in velocity.

    In your paper there is one point not quite correct. The Wilcox polar field strength values align with the sunspot cycle and during the last few decades also line up with the Jupiter/Saturn surges of AM and velocity, but if we go back a few more decades they go right out of sync (sunspot record which follows polar fields). I see the sinusoidal planet effect on the Sun as a background force and is not lined up with the sunspot record.

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