16 Appendix E: On-board Plasma and Magnetic Field Instrumentation
In this section, we briefly describe the working principle of two popular instruments commonly used on
board spacecraft to measure magnetic field and plasma parameters. For sake of brevity, we will only
concentrate on one kind of plasma and field instruments, i.e., the top-hat ion analyzer and the flux-gate
magnetometer. Ample review on space instrumentation of this kind can be found, for example, in Pfaff
et al. (1998a,b).