Diamagnetic pumping in a rotating convection zone

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• 作者：L.L. Kitchatinov^a ; ^b ; ^{kit@iszf.irk.ru" class="auth_mail" title="E-mail the corresponding author} ; A.A. Nepomnyashchikh^a ; ^{nep_a@iszf.irk.ru" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Sun ; magnetic fields ; Magnetohydrodynamics (MHD) ; Dynamo ; Turbulence
• 刊名：Advances in Space Research
• 出版年：2016
• 出版时间：15 October 2016
• 年：2016
• 卷：58
• 期：8
• 页码：1554-1559
• 全文大小：297 K

文摘

Solar dynamo models require some mechanism for magnetic field concentration near the base of the convection zone in order to generate super-kilogauss toroidal fields with sufficiently large (∼$\sim$10²⁴ Mx) magnetic flux. We consider the downward diamagnetic pumping near the base of the convection zone as a possible concentration mechanism and derive the pumping velocities with allowance for the effect of rotation. Transport velocities for poloidal and toroidal fields differ in rotating fluid. The toroidal field is transported downward along the radius only but the pumping velocity for the poloidal field has an equatorward meridional component also. Previous results for cases of slow and rapid rotation are reproduced and the diamagnetic pumping expressions adapted for use in dynamo models are presented.