TY JOUR TI Effect of the Sun on Earth’s seismicity KW Wolf numbers KW earthquakes KW magnitude KW Gutenberg—Richter law KW statistical sum KW solar-terrestrial relations JO Solnechno-Zemnaya Fizika AU Guglielmi, A.V. AU Klain, B.I. PY 2020 IS 6 PB Institute of Solar-Terrestrial Physics SB RAS