Dependence of Venusian IMB and ionopause altitude on the IMF. (a–b) Similar to Fig. 3, but the terminator IMB altitude is further normalized to the average SSN and average solar wind dynamic pressure. (c) The control of the IMF cone angle on the Venusian ionopause altitude normalized to the average solar wind dynamic pressure. (d) The control of the IMF cone angle on the peak value of the magnetic pressure in the induced magnetosphere (IM). Linear regressions (black line) were done to all of the data points (black points). The mean IMB altitude, the mean ionopause altitude and THE mean magnetic pressure in bins (green dots), the standard deviation in each bin (thin red error bars), and the standard error of the mean (thick red error bars) are shown. There is no correlation between the IMB altitude and the IMF magnitude (P-value > 0.01).