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periods ss 27. How are time-varying magnetic fields that may cause errors in magnetic observations used in geological explora

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27) The time varying magnetic field observations can cause errors in data, this is because of due to the diurnal variation. This variation found in everyday. Diurnal variation occurs at the ionosphere of the atmosphere due to the interaction of the Sun Ray. We know that the Ray of sun falling on the earth's surface is not same at every time. That's why as the Sun's position varies the diurnal variation occurs and error in the time varying magnetic data occurs.

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