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A Synchronized Two-Dimensional - Model of the Solar Dynamo.

M Klevs1,2, F Stefani1, L Jouve3

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Summary
This summary is machine-generated.

Tidal forces can synchronize the solar cycle by influencing the Sun's magnetic dynamo. Small, realistic velocities in the tachocline region are sufficient to entrain the dynamo, impacting solar activity predictions.

Keywords:
HelicityModelsSolar cycleTheory

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Area of Science:

  • * Solar physics
  • * Astrophysics
  • * Geophysics

Background:

  • * The Sun's magnetic field is generated by a dynamo process.
  • * The solar cycle, characterized by phenomena like sunspots, has a period of roughly 11 years (Hale cycle of 22 years).
  • * Recent theories propose tidal forces may synchronize the solar cycle.

Purpose of the Study:

  • * To investigate the effect of tidal synchronization on a conventional solar dynamo model.
  • * To determine the necessary amplitude of tidal forces for synchronization.
  • * To assess the realism of these tidal forces in the solar context.

Main Methods:

  • * A conventional solar dynamo model incorporating meridional circulation was used.
  • * An additional time-periodic term, representing tidal influence, was introduced.
  • * The term was localized in the tachocline region, a key layer in the Sun.

Main Results:

  • * The modified dynamo model successfully reproduced key solar dynamo features, including a ~20-year Hale cycle and a realistic butterfly diagram.
  • * Tidal forcing with amplitudes of decimeters per second was found to be sufficient to entrain the dynamo.
  • * Such velocities are considered realistic, potentially generated by tidally excited magneto-Rossby waves.

Conclusions:

  • * Tidal forces can play a significant role in synchronizing the solar cycle.
  • * The proposed mechanism offers a plausible explanation for solar cycle variations.
  • * Further research into magneto-Rossby waves and their interaction with the solar dynamo is warranted.