5.1 A remanently magnetised sphere

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5.1 A remanently magnetised sphere

In this model we compare a normally magnetised sphere in an inclined field with the same sphere with an added remanent component. The remanence vector has a fixed inclination, but is calculated using various declinations.

The grey scale images have look up tables clipped to maximum and minimum values so that the shapes of the anomalies are highlighted. The colour images have a single look up table for all anomalies, so that the intensity of the anomalies may be compared.

Click on the images to launch Noddy. A legend is provided at the end of this page.


	Block Diagram LOAD JPEG IMAGE

	Normally magnetised sphere with remanent component declination
Link	No remanent component	Declination of 000°	Declination of 045°	Declination of 090°	Declination of 135°	Declination of 180°
Grey Scale	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE
Pseudo Colour	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE
Comment						In this model the remanent component exactly cancels out the induced component of the magnetisation.

Key Survey Specifications Scales

sphere

k = 10^-2

sphere remanence intensity

5×10⁴

sphere remanence declination

0° to 180°

background

k = 0

image width

10,000 m

inclination

50°

intensity

50,000 gamma

flying height

200 m

max

min

35,000

-25,000

WWW conversion by Ian Brayshaw