Outstanding Issues in Solar Dynamo Theory

摘要: The magnetic activity of the Sun, as manifested in sunspot cycle, originates deep within its convection zone through a dynamo mechanism, which involves nontrivial interactions between plasma and field solar interior. Recent advances magnetohydrodynamic theory have led us closer towards better understanding physics cycle. In conjunction, helioseismic observations large-scale flows interior has nowmade it possible to constrain some parameters used models first part this review, I briefly describe current state second part, highlight outstanding issues related nature α-effect, buoyancy, origin Maunder-like minima activity. also discuss how poor constraints on key physical processes such turbulent diffusion, meridional circulation, flux pumping confuse relative roles these vis-a-vis transport. argue that unless are addressed, no model cycle can claim be “the standard model,” nor any predictions from trusted; other words, we still not there yet.