Simultaneous observations of the CS by MAVEN and Tianwen-1 on 2025 June 15. Panels (a) and (b) show the spacecraft locations in the ﹩{X}_{{\rm{MSO}}}-\sqrt{{Y}_{{\rm{MSO}}}^{2}+{Z}_{{\rm{MSO}}}^{2}}﹩ and ﹩Y{Z}_{{\rm{MSO}}}﹩ planes. The black and magenta stars denote the positions of MAVEN and Tianwen-1, respectively. Panels (c) and (d) present the magnetic field components measured by MAVEN and Tianwen-1 from 12:00 to 12:10 UT. Panel (e) shows the clock angles derived from the magnetic field measurements.