The Freja satellite mission



Freja, a Swedish and German scientific satellite, was launched successfully on October 6, 1992. Novel plasma instruments give Freja the capability to increase the spatial/temporal resolution orders of magnitudes above that previously achieved on satellites. Freja's high spatial/temporal resolution permits studies of meso- and micro-scale phenomena in the 100-m range for particles and in the 10-m range for electric and magnetic fields. The on-board ultraviolet imager will resolve auroral structures of kilometer size, that is, about an order of magnitude better than Viking (see Figure 1).