Only on rare occasions do the thermodynamics work ; the fluid motions and the magnetic field all evolve in a compatible manner , so the new dipole polarity can diffuse in and establish a reversed magnetic field 只有在很少的情況下熱力學(xué)才發(fā)揮作用,此時(shí)流體運(yùn)動(dòng)和磁場(chǎng)都會(huì)以相互訪調(diào)的方式演化,這樣新的偶極性就會(huì)散開并建立一個(gè)倒轉(zhuǎn)的磁場(chǎng)。