adj. geomagnetic
给出一种测量地磁的新方法，解释了实验中出现的双射频子吸收现象。
An improved method is introduced, through which terrestrial magnetism can be measured and the absorbed phenomenon of double-radiation oscillator emerging in experiments is illustrated.
沈括发现，指南针并不是真正的指向北方，而是指向地磁的北极，这对指南针用于导航走出了决定性的一步。
Kuo discovered that compasses do not point true north but to the magnetic North Pole. This was a decisive step to make them useful for navigation.
地磁活动是地球磁场的自然变化，其波动周期为11年。
Geomagnetic activity, the natural variations in Earth's magnetic field, it fluctuates in 11-year cycles.
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