距单位磁极厘米处的磁场强度。

The magnetic field strength1cm from a unit magnetic pole.

用来测量地球磁场强度和方向的仪器。

An instrument used to measure the strength or direction of the Earth's magnetic field.

所有的金属在磁场强度更大的缺口磁极位置。

All its metal pole pieces in place for higher gap field strength.

但是有一件事是肯定的，太阳活动变缓慢了，它的磁场强度也变弱了。

But one thing is for certain — the sun is slowing down and magnetic activity is growing weaker.