A spherical harmonic analysis of the austral auroral oval |
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| Authors: | IL Thomas FR Bond |
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| Institution: | Physics and Engineering Laboratory, D.S.I.R., Private Bag, Lower Hutt, New Zealand;Antarctic Division, Department of Science, Melbourne, Victoria, Australia |
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| Abstract: | Computerized spherical harmonic analysis is applied to the morphology of the southern auroral oval. Records from 23 All Sky Camera stations together with visual observation reports for the period 1957–1959 constitute the raw data set. The mode of the derived auroral occurrence distribution function F(Kp, θ, φ) is regarded as the maximum probability contour and yields a set of auroral ovals. These 10 contours, one for each Kp level, are expressed in the invariant magnetic co-ordinates of Bond (1968). |
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