Fig. 6.

The flow lines of (a) 50 keV H_h1⁺ ions, (b) 200 keV H_h2⁺ ions, (c) 600 keV H_h3⁺ ions and (d) 3.2 MeV H_h4⁺ ions near Mars in the nominal run. The colour in the z = 0 plane and on the r ~ R_M sphere indicates the normalized density of high energy ions, ñ. The horizontal and the vertical lengths are from −10,000 km to 10,000 km. Note that some of the stream lines extend below the colour plane to the z < 0 hemisphere. The enhanced density (red colour) seen in Fig. 6(a) is because the v × B-force impels ions toward the z < 0 hemisphere (see the text).