Fig. 1From: Statistical study of PMSE response to HF heating in two altitude regionsAn example of PMSE overshoot characteristic curve (OCC) for VHF radar on July 13, 2007, showing the backscatter sampling intervals R0, R1, R2 and R3. The heater was switched-on at 11 h 30 min UT and switched-off at 11 h 30 min 20 s UT. The heater-on time is shown between the vertical dashed linesBack to article page