The NUADU ENA Instrument and Possibilities of Comparative ENA Measurements
with the HENA Instrument on IMAGE

K. Jonsson (Swedish Institute of Space Physics, SE-981 28 Kiruna, Sweden)

The NUADU ENA instrument is scheduled for launch on board the Chinese
scientific satellite Double Star (Polar) in June, 2004. It will measure ENAs
in the energy range 20-310 keV from an Earth polar orbit with a perigee at
700 km and an apogee at 39000 km. Beginning July, 2004 it will be operational
along with the IMAGE spacecraft during the remainder of the IMAGE mission
lifetime. NUADU covers part of the same energy range as the HENA instrument
on IMAGE. In fact, the energy channels on NUADU has been set with HENA energy
channels in mind. It therefore presents an opportunity to make simultaneous
and comparative measurements of the ENA magnetosphere from two different
vantage points. The report will present the NUADU instrument and then focus
on the different vantage points of NUADU and HENA during the fall of 2004 and
beginning of 2005.

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Presentation at the Yosemite Conference of Inner Magnetospheric Interactions,
3 - 6 February 2004, Yosemite, California, USA