How do smartphones work out what direction they are pointing? by Ciaran Beggan on November 14, 2013 BGS Ciaran Beggan geomagnetism gravity field magnetic field NOAA smartphone Swarm True North WMM +
Does the Ionosphere really hum?? by Ciaran Beggan on June 25, 2013 Ciaran Beggan Eskdalemuir geomagnetism induction coil ionosphere +
