TY JOUR TI Geomagnetic observatories of Ukraine in the Global Network INTERMAGNET KW Geomagnetic observatories of Ukraine KW INTERMAGNET KW Earth geomagnetic field JO Russian Journal of Earth Sciences AU Sumaruk, Y.P. AU Starostenko, V.I. AU Legostaeva, O.V. PY 2011 IS 12 PB Geophysical Center of the Russian Academy of Sciences