TY JOUR TI Statistical maps of field-aligned currents inferred from Swarm: dependence on season and interplanetary magnetic field KW solar wind-magnetosphere-ionosphere interaction KW field-aligned currents KW statistical maps KW Swarm satellites JO Russian Journal of Earth Sciences AU , .. AU , .. PY 2018 IS 18 PB Геофизический центр Российской Академии Наук