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The Aurora1

Published online by Cambridge University Press:  27 October 2009

Hugh Carmichael
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Extract

The aurora is a peculiar glow visible in cloud-free night sky. It is most frequently seen in high latitudes, but during very intense displays it may occur even in the tropics. The aurora in the northern hemisphere is called aurora borealis; in the southern aurora australis.

Type
Articles
Information
Polar Record , Volume 4 , Issue 25 , January 1943 , pp. 12 - 16
Copyright
Copyright © Cambridge University Press 1943

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References

page 13 note 1 The North Magnetic Pole (c. lat. 70° 30′ N., long. 96° W.) is the place at which the dip needle sets vertically. The North Magnetic Axis Pole (c. lat. 78° 30′ N., long. 69° W.) is a point which has been determined by calculation from observations of the magnetic field over the whole surface of the earth, and it is the north end of the axis of the average magnetic field of the earth. It differs from the North Magnetic Pole because of field distortions produced by variations in the magnetic properties of the earth's crust.