Fig. 1From: Solar activity dependence of medium-scale traveling ionospheric disturbances using GPS receivers in JapanTwo-dimensional map of detrended TEC at 15:00 UT on 8 June (00:00 LT on 9 June) 2019. TEC data within an area enclosed by solid lines (133.0°–137.0° E and 33.0°–37.0° N) were used to estimate MSTID activity and horizontal propagation direction and velocity of MSTIDsBack to article page