Fig. 5From: Medium-scale traveling ionospheric disturbances over Taiwan observed with HF Doppler sounding(Top) distribution of observed GW horizontal velocities. (Middle) the distribution of normalized function C(s x , s y ) maxima in the analyzed intervals. (Bottom) the distribution of RMS values in the analyzed intervals. Blue color represents all observed events. Red are events selected for statistical analysis based on the selection criteriaBack to article page