Define magnetic elements of earth?

Elements of the earth’s magnetic field are:
1.  Magnetic declination (θ): At a point on earth the magnetic meridian makes an angle with the geographic meridian. This angle is known as the magnetic declination or just declination.
2.  Angle of dip (δ): It is the angle made by the direction of the earth’s total magnetic field with the horizontal direction.
3.  Horizontal component of earth’s magnetic field (BH): It is the component of earth’s magnetic field along the horizontal direction.
So the angle of dip is the angle between earth’s magnetic field i.e. B and the horizontal component i.e. BH.

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do u what the elements to de defined

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the quantities required to completely specify the magnetic field of earth..

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