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IMF clock angle control of multifractality in ionospheric velocity fluctuations

Abel, G.A.; Freeman, M.P.; Chisham, G.. 2009 IMF clock angle control of multifractality in ionospheric velocity fluctuations. Geophysical Research Letters, 36 (19), L19102. 5, pp. 10.1029/2009GL040336

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Abstract/Summary

We present an analysis of 8 years of meridional line-of-sight ionospheric plasma velocity measurements from the Halley SuperDARN radar which investigates the effect of the interplanetary magnetic field (IMF) clock angle on the scaling exponents of the first three order velocity structure functions. We only use velocity measurements made poleward of the open/closed magnetic field line boundary in the nightside ionosphere. The measured scaling exponents are consistent with multifractal Kraichnan-Iroshnikov turbulence for all clock angles but with varying intermittency that decreases to zero during purely northward IMF conditions. We thus propose that intermittency is inherited from the solar wind but also discuss other possible reasons for this relationship. Citation: Abel, G. A., M. P. Freeman, and G. Chisham (2009), IMF clock angle control of multifractality in ionospheric velocity fluctuations, Geophys. Res. Lett., 36, L19102, doi:10.1029/2009GL040336.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2009GL040336
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ecosystems
ISSN: 0094-8276
NORA Subject Terms: Atmospheric Sciences
Space Sciences
Date made live: 15 Oct 2010 12:53
URI: http://nora.nerc.ac.uk/id/eprint/10814

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