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SvalTrackII screen dumps: Panels (A) and (B) show the ovals by Starkov (1994a) and Zhang & Paxton (2008), respectively. (1) Equatorward boundary of the diffuse aurora, (2) Feldstein-Starkov aurora oval, (3) field of view aurora observer, (4) is Zhang-Paxton oval, (5) observer location, (6) Moon and Sun information at local site. Time: 08:50 UT on 24th December 2009. The Kp index equals 3.
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