As the field wanes, the number of sunspots falls to a trough or minimum, at which point the sun's magnetic field reverses direction and starts to regain its strength.
随着磁场减弱，太阳黑子的数量会减少到最小值或者说最低点(波谷)，然后太阳的磁场就会反方向运动，开始重新变强。
Without the minimum output power requirement in the main output just as magnetic amplifier, higher efficiency can be achieved in this circuit.
和磁开关不同，该变流器在主反馈输出上没有最小输出负载的要求，从而电路可以达到更高的效率。
The minimum magnetic field intensity needed to induce significant effect on cathodic limiting diffusion current density decreased with increasing ferric ion concentration.
引起极限扩散电流密度明显增加的临界磁场强度随三价铁离子浓度增加而减小。
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