TY - JOUR A1 - Sergeyeva, N. A1 - Gvishiani, A. A1 - Soloviev, A. A1 - Zabarinskaya, L. A1 - Krylova, T. A1 - Nisilevich, M. A1 - Krasnoperov, R. T1 - Historical K index data collection of Soviet magnetic observatories, 1957–1992 JO - Earth Syst. Sci. Data Discuss. J1 - ESSDD VL - 2020 SP - 1 EP - 18 Y1 - 2020/10/05 PB - Copernicus Publications SN - 1866-3591 UR - https://essd.copernicus.org/preprints/essd-2020-270/ L1 - https://essd.copernicus.org/preprints/essd-2020-270/essd-2020-270.pdf DO - 10.5194/essd-2020-270 ER -