Figure 8

Comparison of amplitudes of the zonal component on the dayside with regard to solar wind parameters. The global distributions of the amplitudes shown are for the cases when the speed of the solar wind is equal to or less than 400 km/s (upper left) and larger than 400 km/s (upper right), and when the cone angle is larger than 50° (lower left) and equal to or less than 50° (lower right).