RUSSIAN JOURNAL OF EARTH SCIENCES, VOL. 20, ES6008, doi:10.2205/2020ES000724, 2020 Figure 1. Distribution histogram of occurrence of different $K$-index values for 2005–2016 calculated with limit value of $K9=500$ nT (black) and 600 nT (grey). Borok observatory (BOX). Copyright 2020 by the Geophysical Center RAS. Generated from LaTeX source by ELXfinal, v.2.0 software package. |