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Fig. 6

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The fitted circular poleward edges of the aurora in the AACGM geomagnetic latitude-MLT frame at three times, half an hour apart (11:20 in green, 11:50 in orange and 12:20 in mauve) on 23 October 2002 (as fitted by Stubbs et al., 2005) transformed into the GSEQ XY frame (where XGSEQ points towards the Sun). The crosses show the location of the eccentric dipole axial pole mapped in the same way and displayed using the corresponding colour. The mapping is for an assumed emission altitude of 130 km: (a) is for the northern hemisphere oval and shows both the pole and the oval moving toward the Sun; (b) is for the southern hemisphere oval and shows both the pole and the oval moving away from the Sun and in the −YGSEQ direction. Note that the ZGSEQ direction is into the plane of the diagram and so the XY plane is here viewed from the southern side and so dawn is the to the left and dusk to the right and noon to the top, (in the +X direction) and hence the motion of the poles with UT is clockwise.

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