Fig. 2From: Propagation characteristics of sporadic E and medium-scale traveling ionospheric disturbances (MSTIDs): statistics using HF Doppler and GPS-TEC data in JapanLocation of the Tx (blue circle), Rxs (red circles), reflection points (i.e., mid-points between Tx and Rx stations, black circles) and the corresponding F region (300 km altitude) mid-points derived by tracing along the magnetic field (green circles)Back to article page