The ionospheric footprint of antiparallel merging regions on the dayside magnetopause

Coleman, I.J.; Pinnock, M.; Rodger, A.S.. 2000 The ionospheric footprint of antiparallel merging regions on the dayside magnetopause. Annales Geophysicae, 18 (5). 511-516.

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Abstract/Summary

The antiparallel merging hypothesis states that reconnection takes place on the dayside magneto- pause where the solar and geomagnetic ®elds are oppositely directed. With this criterion, we have mapped the predicted merging regions to the ionosphere using the Tsyganenko 96 magnetic ®eld model, distinguishing between regions of sub-AlfveÂnic and super-AlfveÂnic magnetosheath ¯ow, and identifying the day-night terminator. We present the resulting shape, width and latitude of the ionospheric dayside merging regions in both hemispheres, showing their dependence on the Earth's dipole tilt. The resulting seasonal variation of the longitudinal width is consistent with the conjugate electric ®elds in the northern and southern cusps, as measured by the SuperDARN HF radars, for example. We also ®nd a seasonal shift in latitude similar to that observed in satellite cusp data.

Item Type:	Article
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	0992-7689
Additional Keywords:	Ionosphere (ionosphere-magnetosphere interactions), Magnetospheric physics (magnetopause, cusp and boundary layers, magnetosphere-ionosphere interactions)
Date made live:	19 Nov 2012 09:23
URI:	http://nora.nerc.ac.uk/id/eprint/20455

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