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Fig. 2.


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Animated model aurora ovals as a function of Kp index for 24th December 2009 at 08:50 UT. The transparent polygons represent Feldstein-Starkov ovals (A). The faint white outer ring is the equatorward boundary of the diffuse aurora (C). The Zhang-Paxton ovals are displayed on top with green intensity values scaled according to the electron energy flux (B). The yellow scaled intensity areas are the intersection (A ∩ B) between the two models.

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