TY JOUR TI Investigation of geo-effective properties of halo coronal mass ejections KW Halo CMEs KW geomagnetic storms KW geo-effectiveness JO Russian Journal of Earth Sciences AU Bhardwaj, S.. AU Khan, P.. AU Atulkar, R.. AU Purohit, P.K. PY 2018 IS 18 PB Geophysical Center of the Russian Academy of Sciences