Why does the sun's torsional oscillation begin before the sunspot cycle?
Although the Sun's torsional oscillation is believed to be driven by the Lorentz force associated with the sunspot cycle, this oscillation begins 2-3 yr before the sunspot cycle. We provide a theoretical explanation of this with the help of a solar dynamo model having a meridional circulation penetrating slightly below the bottom of the convection zone, because only in such dynamo models does the strong toroidal field form a few years before the sunspot cycle and at a higher latitude.
Chakraborty
Sagar
S
Department of Theoretical Sciences, S. N. Bose Centre for Basic Sciences, Kolkata-700098, India.
Choudhuri
Arnab Rai
AR
Chatterjee
Piyali
P