Scale-free statistics of spatiotemporal auroral emissions as depicted by POLAR UVI images: Dynamic magnetosphere is an avalanching system

Details Scale-free statistics of spatiotemporal auroral emissions as depicted by POLAR UVI images: Dynamic magnetosphere is an avalanching system Scale-free statistics of spatiotemporal auroral emissions as depicted by POLAR UVI images: Dynamic magnetosphere is an avalanching system

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1426u&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A12, pp. SMP 7-1, CiteID 1426, DOI 10.1029/2001JA000281

Physics

Plasma Physics

34

Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Storms And Substorms, Space Plasma Physics: Nonlinear Phenomena

Scientific paper

We report first results from a spatiotemporal statistical analysis of ionospheric emissions as observed by the Ultraviolet Imager (UVI) onboard the POLAR spacecraft during 4 months of 1997 and 1998. Approximately 12,300 individual emission events near local midnight with durations exceeding the sampling time of the image sequences are investigated. The probability distributions of these events over the lifetime T, maximum area A, integrated area S, maximum power W, and integrated energy output are shown to obey distinct power law relations p ~ T-2.2, p ~ A-1.8, p ~ S-1.6, p ~ W-1.7, p ~ E-1.5 over a wide range of scales. The observed behavior is consistent with the behavior of statistical-physical avalanche models near a stationary critical state. These results support the hypothesis of self-organized critical dynamics of the magnetosphere and suggest an important role for cross-scale coupling effects in the development of geomagnetic disturbances.

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