Multi-Wavelength Investigations of Solar Activity Contributed Papers
Full Sphere Axisymmetric Simulations of the Solar Dynamo
Dibyendu Nandy a1, Piyali Chatterjee a2andArnab Rai Choudhuri a2 a1 Department of Physics, Montana State University, Bozeman, MT 59717, USA email: [email protected] a2 Department of Physics, Indian Institute of Science, Bangalore 560012, India
We explore a full sphere (2D axisymmetric) kinematic solar dynamo model based on the Babcock-Leighton idea that the poloidal field is generated in the surface layers from the decay of tilted bipolar solar active regions. This model incorporates the helioseismically deduced solar rotation profile and an algorithm for buoyancy motivated from simulations of flux tube dynamics. A prescribed deep meridional circulation plays an important role in the advection of magnetic flux. We specifically address the parity issue and show that – contrary to some recent claims – the Babcock-Leighton dynamo can reproduce solar-like dipolar parity if certain reasonable conditions are satisfied in the solar interior, the most important requirement being that the poloidal field of the two hemispheres be efficiently coupled across the equator.