Fractal Characteristics of the Auroral Oval Structure According to the All-Sky Camera Data in Apatity for 2013–2020

The spatial structure of polar auroras is described by the fractal dimension of glow fluctuations and its anisotropy from direction. The fractal dimension is estimated from the slope in the logarithmic axes of the spectrum in the range of 1.5–50 km, obtained through discrete wavelet transformation of the intensity fluctuation of the glow using Daubechies wavelets of order 5. The variability of the structures is characterized by the slope of the anisotropy variation spectrum over time. The statistics of these characteristics are presented according to the data of the ground-based all-sky camera of the Polar Geophysical Institute in Apatity for 2013–2020 and referenced to the position inside the auroral oval and the values of the geomagnetic field at Lovozero observatory. An algorithm for modeling the structure of polar auroras based on these characteristics is discussed.