Fig. 3

Geometry of the electron scale magnetic cavity obtained by sounding technique. All data are re-organized in XY plane of the plasma rest frame. Solid circles, crosses, and asterisks represent MMS1, MMS3, and MMS4, respectively. Different colors denote different energy channels, labeled in the top left corner. A circle (R_MC, ∼8ρ_e) that best fits the data points was obtained. The solid part of the circumference is surrounded by data, where a light gray region illustrates the uncertainty (∆R). The radius and the uncertainty are labeled in the top right corner. Spacecraft trajectories are plotted as gray arrowed lines. ρ_e is the gyro-radius of a thermal electron in the event discussed in this paper