HR: 1340h
AN: NG23A-1191    [Abstracts]
TI: A Structure Function Analysis of Ionospheric Velocity and Ground-Based Magnetic Field Fluctuations.
AU: * Abel, G A
EM: gaab@bas.ac.uk
AF: British Antarctic Survey, High Cross Madingley Road, Cambridge, CB3 0ET
AU: Freeman, M P
EM: mpf@bas.ac.uk
AF: British Antarctic Survey, High Cross Madingley Road, Cambridge, CB3 0ET
AU: Nash, R
EM: rupert@nash.me.uk
AF: British Antarctic Survey, High Cross Madingley Road, Cambridge, CB3 0ET
AU: Nash, R
EM: rupert@nash.me.uk
AF: University Of Cambridge, St Catharine's College Trumpington Street , Cambridge, CB2 1RL United Kingdom
AB: A number of recent studies have investigated temporal structuring within the magnetosphere ionosphere system. Studies of ground magnetometer measurements, ionospheric velocity fluctuations, inter FTE intervals, and the AE index, have shown evidence of scale free behaviour. In contrast little work has been done to characterise the spatial structuring. With the large field of view of the SuperDARN radars we have the facility to investigate the spatial structure of ionospheric flows. We present a structure function analysis of 5 years of data from the Halley radar in Antarctica comparing contemporaneous measurements of ionospheric meridional velocities at different range separations. We find strong evidence for scale free behaviour both above and below the open-closed field line boundary and show that it is possible to collapse the distributions of fluctuations at different separations to a single distribution using appropriate scaling. We complement these results with a temporal and spatial structure function analysis of ground-based magnetometer data from the British Antarctic Survey's Low Power Magnetometer network.
DE: 7839 Nonlinear phenomena
DE: 2463 Plasma convection
SC: Nonlinear Geophysics [NG]
MN: 2004 AGU Fall Meeting