Radar and Particle Observations of the Double Cusp: Resolving Spatiotemporal Ambiguities

Details Radar and Particle Observations of the Double Cusp: Resolving Spatiotemporal Ambiguities Radar and Particle Observations of the Double Cusp: Resolving Spatiotemporal Ambiguities

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12b..01c&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12B-01

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2724 Magnetopause, Cusp, And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions, 7835 Magnetic Reconnection

Scientific paper

The role of radar observations in resolving the ambiguities between spatial and temporal interpretations of the double cusp will be outlined, and related to the wider context of understanding the large-scale physics of reconnection. Our recent work has established that dayside reconnection under conditions of significant IMF y-component can lead to a split reconnection x-line on the magnetopause, which is observable in the polar ionosphere when the geometry of field-line mapping to the ionosphere is favourable. In this presentation, simultaneous DMSP particle data and SuperDARN radar data will be shown from a split x-line event, demonstrating the connection between split x-line radar signatures and double-cusp particle signatures. Separated reconnection sites will in general have different histories and velocity filter characteristics: the observable consequences of this in the double cusp signature will be discussed. Both temporal and spatial variability in the reconnection site can give rise to a particle cusp discontinuity, and the utility of ground-based data in determining which of these is more important in any particular case will be assessed.

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