Sweden's second satellite
with a significant contribution from Germany.
Launched on 6 October 1992 from Jiuquan satellite launch centre in
the Gobi Desert, People's Republic of China, into a 600 by 1770 km orbit with
63 degrees inclination. It has since been delivering some 200 megabytes' worth
of data each day. Freja ceased to operate on 14 October 1996. The seven
instruments on board were built by groups in Sweden, Germany, Canada and
the United States. As with Viking, the Alfvén Laboratory built the
instrument measuring the electric field. The main scientific objective
is also here the auroral acceleration processes, but in this case the
satellite is observing fields and waves below the acceleration region
and particles after they have been accelerated.
The group has authored or co-authored more than 35 refereed publications
based on electric field data from Freja.
Freja Data Summary Plots
are available online from the Johns Hopkins University.
For more information contact Göran Marklund.