Fig. 1From: High-energy electron experiments (HEP) aboard the ERG (Arase) satellitePhotograph of HEP flight model. The marked axes are the satellite coordinates shown in Fig. 2. In the left part of the figure, it can be seen that the hexagonal cylinder houses three HEP-L modules and three HEP-H modules. Electronics boards are housed in the black box shown in the right part of the figure. Each of the three sides of the hexagonal cylinder includes two cutouts through which the electrons enter the HEP-L/HEP-H sensorsBack to article page