From the distribution of rotation period and convection parameter of m type stars , stellar chromospheric activity of m type stars depart from the anticipation of a . dynamo theory obviously 从m型主序星的自转周期的和恒星内部对流区随色指数的分布来看, m型主序星的色球活动行为与发电机理论的预期有明显的差异。
In geophysics, dynamo theory proposes a mechanism by which a celestial body such as the Earth or a star generates a magnetic field. The theory describes the process through which a rotating, convecting, and electrically conducting fluid can maintain a magnetic field over astronomical time scales.