Rotating magnetic field is not caused by mechanical methods, but in AC pass in a few of the electromagnet, the nature of its magnetic cycle of change can be seen as rotating magnetic field.

转动磁场并不是用机械方法造成的，而是以交流电通于数对电磁铁中，使其磁极性质循环改变，可看作为转动磁场。

youdao

Now that the Sun is approaching the peak of its magnetic cycle, when solar storms - blasts of electrically charged magnetic clouds - are most likely to occur, no one can predict how it will behave.

现在，太阳正在接近其磁周期的顶峰，也就是太阳风暴最可能发生的时期，没有人能够预测到太阳未来的表现。太阳活动会持续低迷？

youdao

The sun is currently approaching what's known as solar maximum, the peak of our star's roughly 11-year cycle of magnetic activity.

因为目前的太阳正逐渐接近它的“活动峰年”，也就是周期约为11年的地磁活跃高峰期。

youdao

Matt Penn and William Livingston of the National Solar Observatory predict that by the time Solar Cycle 25 arrives, magnetic fields on the sun will be so weak that few if any sunspots will be formed.

FORBES: To The Horror Of Global Warming Alarmists, Global Cooling Is Here