Proton number density and velocities in different planes, for different upstream IMF conditions. Arrows show the direction of the IMF. Top three rows show number density for different upstream IMF directions. Along the directions (x, y) = (0, 1), (1, 1), and (1, 0), respectively. The geometry is repeated in the lower three rows (4–6) for the proton velocities u
− usw, u
, and u
. The columns are from the left, cuts in the planes z = 0 (seen from +z), y = 0 (seen from +y), x = −10000 km, and x = −30000 km (seen from +x). Figure 1 provides a three-dimensional illustration of the cutting planes. The two vertical lines in (1–3b) show the position of the cuts perpendicular to the x-axis.