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[SIT22-35] Temperature perturbation at ICB induced by CMB heat flux variation in numerical dynamos
Keywords:dynamo simulation, Inner core boundary
In the present study, we perform dynamo simulations with changing amplitude of the heat flux variation at CMB with fixing dimensionless numbers. We choose the Y22 component of the spherical harmonics for the heat flux variation. The amplitude of the perturbation q* is defined by ratio of the perturbation to the average heat flux at CMB.
The results suggests that the temperature perturbation with Y22 component at ICB is generated by the given heat flux variation at CMB. However, the amplitude of the Y22 component is approximately 30% of the temperature perturbation with Y20 component which is generated by the convection of the outer core. In the present simulations, magnetic field is not sustained in the cases with q* > 1.403. By exploration of the results with sustaining the magnetic field, the Y22 component of the temperature perturbation will exceed the Y20 component at ICB in q* >130.