TY JOUR TI Ionospheric response to annular and partial solar eclipse of 29 April 2014 in Antarctica and Australian Regions KW Annular solar eclipse KW ionospheric parameters KW sporadic $E$ KW critical frequency JO Russian Journal of Earth Sciences AU , .. AU , .. AU , .. AU , .. PY 2015 IS 15 PB Геофизический центр Российской Академии Наук