Recent studies have showed that the bio-effective strength of magnetic field is determined by both its intensity and exposing time.

方法实验设计模拟扫雷艇作业时舰员可能接触的磁场强度、磁场类型及暴露时间。

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We create a condition. And in plasma world and world of creation, the conditions can only be created by strength of magnetic field in respect to each other.

我们创造了一个条件，在等离子世界和万物的世界中，条件只能是被磁场之间有关的力所创造出来的。

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At the Earth's surface, these tempests can be detected by changes in the strength of the Earth's magnetic field.

在地球表面，可以通过改变地球磁场强度来检测这些风暴。

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The most persuasive evidence that Voyager 1 has crossed the termination shock is its measurement of a sudden increase in the strength of the magnetic field carried by the solar wind, combined with an inferred decrease in its speed.

BBC: Voyager impression (Nasa)

Mr Wechlin adds that, during charging time, people stay inside the buses - something he says is absolutely safe, as the strength of the magnetic field produced is within the limits recommended by the International Commission on non-ionizing radiation protection (ICNIRP).

BBC: Wireless charging - the future for electric cars?

Moreover, there is (controversial) evidence of a long-term weakening trend in the magnetic field strength of sunspots.

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