TY  JOUR
TI  The aspects of K-index calculation at Russian Geomagnetic Observatories
KW  Geomagnetic observatories
KW  geomagnetic data
KW  magnetograms
KW  𝐾-index
KW  𝐾𝑝-index
KW  𝐾9 limit
JO  Russian Journal of Earth Sciences
AU  Petrov, V..
AU  Krasnoperov, R..
PY  2020
IS  20
PB  Geophysical Center of the Russian Academy of Sciences