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Home News Contact Us Research Sections 11 online users   Ionospheric data measured in institute of geophysics university of Tehran  Location:  Geographic latitude: 35° 44′ 17.5″  Geographic longitude: 51° 23′ 6.4″  Geomagnetic latitude: 29° 0.71′  Geomagnetic longitude: 128° 52′ Critical frequency of F2 layer (MHz) Virtual height of F2 layer (km) 2007 2006 January February March April May June July August September October November December The Ionosphere Section