The bottom panel in Fig. 11 shows the propagation velocities with error bars (bottom plots) calculated by the time delay method (blue) and by the tilt method (magenta) for Taiwan as a function of daytime.
It can be verified that both methods gave consistent results within the estimated uncertainties; the mean uncertainty of velocities obtained by the tilt method and by the time delay method was 27 and 12 m s−1, respectively.
It should be stressed that all events analyzed by the time delay method were also analyzed by the tilt method in both locations and that the data cover all months of OSS occurrence.
Values determined by the time delay method shown in blue; velocities determined by the tilt method shown in magenta.
Therefore, on the basis of our evaluation of Doppler records and comparison with velocities obtained by the time delay method, we determined the average uncertainty in ΔT to be about 3 min, ε ΔT = 3 min.
Values determined by the time delay method are shown in blue; and velocities determined by the tilt method are shown in magenta.
The top panel in Fig. 11 presents the azimuths of propagation obtained by the time delay method for Taiwan.
In this way, first, signals are sketched in the state space by the delay time method.
In total, 22 events were analyzed by using the time delay method, i.e., about 40%% of all the detected events; the time delay method was not applicable for the remaining events.
In total, 143 OSS events from 314 were analyzed in Tucumán by using the time delay method.
