Geomagneticactivity, the natural variations in Earth's magnetic field, it fluctuates in 11-year cycles.
地磁活动是地球磁场的自然变化，其波动周期为11年。
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It was found that the occurrence rate, current intensity and density increase with an increasing level of geomagneticactivity.
统计结果表明，场向电流的发生率、强度和密度都随地磁活动的增加而增大。
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Additionally, it's also true that geomagnetic "storms" caused by solar activity can disrupt some radio communications, endanger satellites and even knock out power systems.