For a sunspot to form on the solar surface, the magnetic field needs to attain a certain strength to push the surface plasma aside, exposing the solar interior as a cool spot — a sunspot.
在太阳表面，磁场强度必须强到能推开表面的等离子体，将温度较低太阳内部的暴露在外，形成一个太阳黑子。
Due to a stably stratified fluid and an extremely high electrical conductivity in the solar interior, a relic solar magnetic field can survive for a very long time.
由于太阳内部高电导率和准静态等因素，其剩余磁场耗散相当缓慢，而得以保留至今。
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