%0 Generic %1 citeulike:13807172 %A Isık, Emre %D 2015 %K imported %T A mechanism for the dependence of sunspot group tilt angles on cycle strength %U http://arxiv.org/abs/1510.04323 %X The average tilt angle of sunspot groups emerging throughout the solar cycle determines the net magnetic flux crossing the equator, which is correlated with the strength of the subsequent cycle. I suggest that a deep-seated, non-local process can account for the observed cycle-dependent changes in the average tilt angle. Motivated by helioseismic observations indicating cycle-scale variations in the sound speed near the base of the convection zone, I determined the effect of a thermally perturbed overshoot region on the stability of flux tubes and on the tilt angles of emerging flux loops. I found that 5-20 K of cooling is sufficient for emerging flux loops to reproduce the reported amplitude of cycle-averaged tilt angle variations, suggesting that it is a plausible effect responsible for the nonlinearity of the solar activity cycle.

@misc{citeulike:13807172, abstract = {{The average tilt angle of sunspot groups emerging throughout the solar cycle determines the net magnetic flux crossing the equator, which is correlated with the strength of the subsequent cycle. I suggest that a deep-seated, non-local process can account for the observed cycle-dependent changes in the average tilt angle. Motivated by helioseismic observations indicating cycle-scale variations in the sound speed near the base of the convection zone, I determined the effect of a thermally perturbed overshoot region on the stability of flux tubes and on the tilt angles of emerging flux loops. I found that 5-20 K of cooling is sufficient for emerging flux loops to reproduce the reported amplitude of cycle-averaged tilt angle variations, suggesting that it is a plausible effect responsible for the nonlinearity of the solar activity cycle.}}, added-at = {2019-03-25T08:20:55.000+0100}, archiveprefix = {arXiv}, author = {I\c{s}{\i}k, Emre}, biburl = {https://www.bibsonomy.org/bibtex/2fa2f1035bf464942201d849726184b30/ericblackman}, citeulike-article-id = {13807172}, citeulike-linkout-0 = {http://arxiv.org/abs/1510.04323}, citeulike-linkout-1 = {http://arxiv.org/pdf/1510.04323}, day = 14, eprint = {1510.04323}, interhash = {9adc7bebd80c7acf89f187069ef9c86c}, intrahash = {fa2f1035bf464942201d849726184b30}, keywords = {imported}, month = oct, posted-at = {2015-10-20 05:18:25}, priority = {2}, timestamp = {2019-03-25T08:20:55.000+0100}, title = {{A mechanism for the dependence of sunspot group tilt angles on cycle strength}}, url = {http://arxiv.org/abs/1510.04323}, year = 2015 }