ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 3, pp. 184-191

Analytical expression of lightning strokes density spatial distribution over North Asia

L.D. Tarabukina 1, 2 , V.I. Kozlov 1, 2  , R.R. Karimov 1 
1 Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS, Yakutsk, Russia
2 M.K. Ammosov North-Eastern Federal University, Yakutsk, Russia
Accepted: 25.04.2016
DOI: 10.21046/2070-7401-2016-13-3-184-191
The numerical simulation of spatial distribution of lightning stroke density is suggested based on data from World wide lightning location network (WWLLN). The raw data was corrected by the spatial coefficient of network detection efficiency. Resulted map is the average for summer season (1 June – 31 August, 2009-2014) lightning strike density and better describes the distribution of strikes with currents more than 100 kA due to WWLLN’s measuring features. The average variations of lightning density with latitude, longitude and terrain elevation are derived. The density variations with latitude and longitude are presented as sum of linear fit interpreting lightning activity decrease northward and eastward and Gauss function approximating high lightning density patterns. The density variation with terrain elevation is approximated with sum of three Gauss functions, peaks of which are associated with three local density maxima. These peaks are caused by different effects of orography influence on air convection. The geometric mean of functions approximating density dependence on latitude, longitude and elevation multiplied on the coefficient characterizing total level of density and defined by least residuals with data gives the determination coefficient of 0.6. When stroke density is assumed as function of latitudinal variations of stroke density with longitude, the analytical expression shows better fit to the data (coefficient of determination is 0.8).
Keywords: lightning stroke density, North Asia, lightning, spatial distribution of density
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