Normalized total gradient method, which can be used to determine location of magnetic field source above hydrocarbon accumulations;
用归一化总梯度法确定油气上方场源位置；
Geophysicists have long known that the source of the fluctuating magnetic field lies deep in the center of the earth.
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。
The 11-hour intervals approximated but didn't match Saturn's rotation rate, so the planet's magnetic field couldn't be the source.
11个小时的间隔接近土星的转动速度，但是并不正好匹配，因此土星的磁场不是信号源。
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