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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
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Normally magnetised sphere with remanent component declination
Link
No remanent component
Open history with NoddyOpen FracViewer Movie 
Declination of
000°
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Declination of
045°
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Declination of
090°
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Declination of
135°
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Declination of
180°
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Grey Scale
Open magnetics with Noddy
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Open magnetics with Noddy
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Open magnetics with Noddy
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Open magnetics with Noddy
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Open magnetics with Noddy
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Open magnetics with Noddy
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Pseudo Colour
Open magnetics with Noddy
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Open magnetics with Noddy
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Open magnetics with Noddy
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Open magnetics with Noddy
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Open magnetics with Noddy
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Open magnetics with Noddy
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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

 

All models created using Noddy
Copyright © 1998 AGCRC & Mark Jessell

WWW conversion by Ian Brayshaw