Mathematics – Probability
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11310303g&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue A10, CiteID A10303
Mathematics
Probability
4
Ionosphere: Auroral Ionosphere (2704), Ionosphere: Electric Fields (2712), Mathematical Geophysics: Wavelet Transform (3255, 4455), Atmospheric Processes: Turbulence (4490), Nonlinear Geophysics: Probability Distributions, Heavy And Fat-Tailed (3265)
Scientific paper
Auroral images obtained by the Auroral Large Imaging System, an optical facility with extremely low noise level and large dynamical range, have been examined in order to study the scaling properties of spatial variations in auroral luminosity. The images under examination were obtained during substorm conditions and contained active auroral forms of different types. The field of view was +/-17° from magnetic zenith, which allowed the investigation of auroral fluctuations at scales from 6.4 to 51.2 km. The narrow field of view is assumed to decrease the contamination from aspect angle broadening which leads to distortions of scaling characteristics in the horizontal plane. We analyzed the logscale diagrams constructed by discrete wavelet transform of the data as well as the standard deviation, kurtosis, and probability density functions of the fluctuations. It is found that the data series for substorm auroral forms often reveal closeness to self-similarity, the observed scaling exponent varying between 0.6 and 0.7. Auroral fluctuations in different emission lines exhibit a very similar scaling behavior. A comparison is performed with fluctuations in an electric field observed by the Dynamics Explorer 2 satellite under substorm conditions. It is shown that the intermittency features are more pronounced for substorm electric fields than for auroral fluctuations.
Brändström Urban
Golovchanskaya I. V.
Kozelov Boris V.
Nilsson Hampus
Sandahl Ingrid
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