13 - 2 declination-angle magnetic field and geographic...

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17:33 Compass readings is a reflection of the earth’s magnetic field generated by motion of the liquid outer core 90% Fe magnetic filed is like a bar magnet dipolar poles aligned with earth’s spin axis -The field looks like that produced by a dipole located a the center of the earth -The field is inclined with respect to the axis of rotation -Freely suspended compass needle line up along the magnetic lines of force Lines of force are more vertical near the poles and more horizontal near the  equator Orientation of earth’s magnetic field at a point defined by 2 measurements: 1.  inclination  (i) : angle between magnetic flux and horizontal (ie. Earths  surface) SEE DIAGRAM You can use the inclination angle to determine the latitude
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Unformatted text preview: 2. declination-angle magnetic field and geographic north SEE DIAGRAM Declination defines longitudinal position (east vs. west) Rock Magnetism A) Magnetic mineral grain at a temperature above the Curie point (>600 degress C) Magnetic domains are randomly oriented with no net magnetization B) Magnetic mineral grain has cooled to a temperature below the Curie point in the presence of the earth’s magnetic filed (blue arrow) Magnetic domains have lined up in the direction of the earth’s field producing a net permanent magnetization in that direction Records the magnetic field in newly deposited sediment Permanent record of the orientation *The earth’s magnetic field switches direction 17:33 17:33...
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13 - 2 declination-angle magnetic field and geographic...

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