Spatial structure of ionospheric convection velocities in regions of open and closed magnetic field topology
Abel, G.A.; Freeman, M.P. ORCID: https://orcid.org/0000-0002-8653-8279; Chisham, G. ORCID: https://orcid.org/0000-0003-1151-5934. 2006 Spatial structure of ionospheric convection velocities in regions of open and closed magnetic field topology. Geophysical Research Letters, 33 (24). L24103. 10.1029/2006GL027919
Full text not available from this repository. (Request a copy)Abstract/Summary
We present a spatial structure function analysis of ionospheric velocity, measured by the Halley Super Dual Auroral Radar Network (SuperDARN) radar over five years. We show evidence for scale-free velocity fluctuations for separations from 45 km to ∼1000 km. For larger separations a deviation from scale-free structure is seen that we interpret as the influence of the global convection pattern. We find evidence for scale-free structure in regions of both open and closed field line topology, though with different power-law exponents. The measured power-law exponents poleward and equatorward of the open-closed field line boundary are 0.31 and 0.39 respectively. We propose that the scale-free spatial structure of ionospheric velocity fluctuations on open magnetic field lines is a reflection of the spatial structure of the solar wind and the scale-free spatial structure of ionospheric velocity fluctuations on closed magnetic field lines is dictated by the internal dynamics of the magnetosphere-ionosphere system.
Item Type: | Publication - Article |
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Digital Object Identifier (DOI): | 10.1029/2006GL027919 |
Programmes: | BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Natural Complexity Programme |
ISSN: | 0094-8276 |
Additional Information. Not used in RCUK Gateway to Research.: | Full text not available from this repository |
NORA Subject Terms: | Atmospheric Sciences Space Sciences |
Date made live: | 04 Sep 2007 15:30 +0 (UTC) |
URI: | https://nora.nerc.ac.uk/id/eprint/855 |
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