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.
显然，试图解释和预测磁场变化的地球物理学家必须了解外核发生了什么。
Clearly, geophysicists who seek to explain and forecast changes in the field must understand what happens in the outer core.
地球磁场不同的变化会造成它们不同的自旋方式，每种方式都会让罗盘的化学状态表现出细微的差异。
Variations in Earth’s magnetic field cause them to spin in different ways, each of which leaves the compass in a slightly different chemical state.
海龟利用地球磁场的变化分辨南北方位，从而指引自己沿正确的纬度迁徙，这对科学家来说并不陌生。
Scientists already knew that the creatures used changes in Earth's magnetic field to help them tell north from south and steer themselves along the right latitude.
海龟利用地球磁场的变化分辨南北方位，从而指引自己沿正确的纬度迁徙，这对科学家来说并不陌生。
Scientists already knew that the creatures used changes in Earth’s magnetic field to help them tell north from south and steer themselves along the right latitude.
这种变化与地球磁场曾经发生过的变化相比还算温和的——有时地球磁场会完全翻转，地磁北极和地磁南极会对调。
These changes are mild compared to what Earth's magnetic field has done in the past - sometimes the field completely flips, with the north and the south poles swapping places.
这种变化与地球磁场曾经发生过的变化相比还算温和的——有时地球磁场会完全翻转，地磁北极和地磁南极会对调。
These changes are mild compared to what Earth's magnetic field has done in the past —sometimes the field completely flips, with the north and the south poles swapping places.
磁场的变化是像太阳这样的恒星表面黑子活动周期的根源，尽管经过几十年的认真研究之后，地球人仍然对其知之甚少。
The magnetic activity of stars like sun, which is the root cause of the sunspot cycle, is still poorly understood even after decades of intense study.
他们还用各种各样的仪器和方法，通过测量地震前发生的地球物理上的变化，如地表倾斜度和活性断层附近的磁场变化，对地震进行预测。
These instruments measure tilts int the ground's surface, as well as changes in the magnetic field near active faults . Usually these changes precede the occurrence of some earthquakes.
地球物理学家很早就知道，地球磁场变化的原因深藏于地球中心。
Geophysicists have long known that the source of the fluctuating magnetic field lies deep in the center of the earth.
地球的磁场在其它方面也在处于变化中——全球的磁场强度在19世纪后减弱了10%。
Earth's magnetic field is changing in other ways, too - globally, the magnetic field has weakened 10 percent since the 19th century.
地球的磁场在其它方面也在处于变化中——全球的磁场强度在19世纪后减弱了10%。
Earth's magnetic field is changing in other ways, too -globally, the magnetic field has weakened 10 percent since the 19th century.
“众所周知地球的磁场是变化的，无时无刻不在变化”雷蒙德教授说。
"We've always known that the Earth's magnetic field is variable, constantly evolving in time," Raymond said.
地球气候的变化趋势正好和太阳磁场与能量输出的变化趋势相吻合。
The ups and downs of temperatures on the earth match exactly the ups and downs and changes in the magnetism and energy output of the sun... read more.
地球气候的变化趋势正好和太阳磁场与能量输出的变化趋势相吻合。
The ups and downs of temperatures on the earth match exactly the ups and downs and changes in the magnetism and energy.
泰勒博士和沙巴卡博士任职于马里兰州的戈达德太空遨游飞翔中心，他们负责观测那些可以或许检测海水流动引起的地球磁场的微小变化的卫星。
Dr Tyler and Dr Sabaka, who work at the Goddard Space Flight Centre, in Maryland, observe that satellites can detect small changes in Earth's magnetic field induced by the movement of water.
他们还发现地球磁场变化的幅度取决于从海水表面一路下降到海底的温度变化。
They also observe that the magnitude of such changes depends on the water's temperature all the way down to the ocean floor.
由于方向和强度都在变化并且在不同的地方变化程度也不一样，因此很难说出地球磁场作为一个整体是如何变化的。
Since both of these change, and change differently in different places, it is not easy to say how the field of the Earth as a whole is changing.
磁法勘探是观测研究地下介质磁场变化的一种地球物理勘探方法。
Magnetic exploration is a geophysical method on magnetic change observed in the underground medium.
地球磁场总是在不停地变化，并且其变化的方式也在变化。
The Earth's magnetic field is constantly changing, and the way, which it changes, also changes.
用国际参考地磁场模型（IGRF）分析了地磁场能量在地球内部的分布及其长期变化。
The eighth generation of the International Geomagnetic Reference Filed (IGRF)is used to study distribution of geomagnetic energy in the Earths interior and its secular variations.
地球核心的磁场正在移动，不加夸张地说，地球内部的方向在发生变化。
The magnetic core of the Earth is moving, literally changing directions inside the Earth.
地球各种特征每天的变化，如温度、局部地磁场每天的变化、以及阳光每天的变化。
The daily variation in properties of the Earth, such as the temperature or the local geomagnetic field, or the daily change in sunlight.
这些公式把多普勒频移与电离层及不均匀团块的电子密度变化、层和团块的运动速度以及地球磁场强度变化等参数直接联系起来。
By using the formulas, the Doppler shifts are related to the variation of electron density of both the ionosphere and the inhomogeneous mass, to the moving velocity of the layer a...
利用许多地磁观测站的资料，地球物理学家对磁场及其变化方式进行数学描述。
Using data from many magnetic observatories, geophysicists can make mathematical representations of the field and how it is changing.
结果是地球磁场的分布和变化与臭氧层的分布和变化具有明显的一致性，这种一致性是地球磁场影响的结果。
The result shows that the distribution and the change of geomagnetic field are in line with the distribution and the change of ozone sphere. It is believed that this is the result o…
结果是地球磁场的分布和变化与臭氧层的分布和变化具有明显的一致性，这种一致性是地球磁场影响的结果。
The result shows that the distribution and the change of geomagnetic field are in line with the distribution and the change of ozone sphere. It is believed that this is the result o…
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