Solar wind-magnetosphere-ionosphere coupling: an event study based on Freja data

Details Solar wind-magnetosphere-ionosphere coupling: an event study based on Freja data Solar wind-magnetosphere-ionosphere coupling: an event study based on Freja data

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..375b&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 5, p. 375-380.

Physics

2

Low-Latitude Boundary Layer, Magnetosphere-Ionosphere Coupling, Polar Cap Potential, Polar Cusp, Solar Wind-Magnetosphere Coupling

Scientific paper

Freja data are used to study the relative contributions from the high-latitude (reconnection/direct entry) and low-latitude (viscous interaction) dynamos to the cross-polar potential drop. Convection streamlines which are connected to the high-latitude dynamo may be identified from dispersed magnetosheath ions not only in the cusp/cleft region itself but also several degrees poleward of it. This fact, together with Freja's orbital geometry allows us to infer the potential drop from the high-latitude dynamo as well as to obtain a lower limit to the potential drop from the low-latitude dynamo for dayside Freja passes. All cases studied here are for active magnetospheric conditions. The Freja data suggest that under these conditions at least one third of the potential is generated in the low-latitude dynamo. These observations are consistent with earlier observations of the potential across the low-latitude boundary layer if we assume that the low-latitude dynamo region extends over several tens of Earth radii in the antisunward direction along the tail flanks, and that the majority of the potential drop derives from the sun-aligned component of the electric field rather than from its cross-boundary component, or equivalently, that the centre of the dynamo region is located quite far down tail. A possible dynamo geometry is illustrated.

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