Motion of aurorae

Details Motion of aurorae Motion of aurorae

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3708104c&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 8, CiteID L08104

Physics

3

Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Ionosphere: Particle Acceleration, Magnetospheric Physics: Forecasting (1922, 7924, 7964), Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836)

Scientific paper

Using high resolution auroral imagery and particle measurements from the Reimei spacecraft we distinguish ‘Alfvénic’ and ‘quasi-static’ auroral forms and implement a new multi-scale wavelet analysis technique to examine how the vorticity in these forms varies as a function of scale transverse to the geomagnetic field. We find from this analysis that the complex motions of aurorae can be described by power-laws relating spatial scale to optical vorticity. We demonstrate how these relationships naturally arise from the ‘conductance’ of geomagnetic field-lines and the physics of Alfvén waves.

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