Fig. 3.
From: Ion acceleration by multiple reflections at Martian bow shock
Illustration of three different magnetic field configurations at the bow shock. The dashed grey lines indicate the average position of the bow shock and magnetopause (Vignes et al., 2000). Solid lines outside the bow shock (marked by B) denote the magnetic field orientation, and empty arrows to the right (marked by SW) denote the solar wind. (a) Quasi-perpendicular shock by which specular reflection direction is nearly perpendicular with respect to the magnetic field (QT). (b) Quasi-perpendicular shock by which specular reflection direction is oblique or parallel to the magnetic field (foreshock configuration, FS). (c) Quasi-parallel shock (QL). (d) The rightmost panel illustrates the azimuthal locations of three types of the shock when the bow shock is viewed from the Sun.