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Fractal reconnection at the Earth's magnetopause \& associated ionospheric convection

Abel, G (British Antarctic Survey)
Monday 09 August 2004, 10:30-10:45

Seminar Room 1, Newton Institute


Large scale properties of reconnection structures on the magnetopause can be explained successfully by simple models incorporating laminar magnetosheath flow with antiparallel reconnection. However, such models are inconsistent with the highly turbulent nature of the magnetosheath flow adjacent to the magnetopause. This presentation proposes a fractal reconnection model that resolves this contradiction by replacing the laminar magnetosheath flow with a turbulent flow which has realistic levels of fluctuation. The resultant fractal reconnection structures preserve the large scale behaviour of simpler models, consistent with ground based observations, but have small scale fluctuations consistent with those observed in situ by spacecraft. We also present observations of evidence for scale-free fluctuations in ionospheric convection associated with dayside reconnection. This scale free behaviour may well arise as a consequence of the fractal reconnection model proposed.


[ppt ]


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