SWI - Submillimetre Wave Instrument
The Submillimetre Wave Instrument (SWI) will investigate the Galilean moons of the giant planet Jupiter, the chemistry, meteorology, and structure of Jupiter’s middle atmosphere as well as atmospheric and magnetospheric coupling processes. By characterising Jupiter as a planet and possible habitat, and the investigation of more recent active areas within Europa’s ice crust, SWI will provide data for further investigations of habitable on the Galilean moons Ganymede, Europa and Callisto. Furthermore, the instrument will investigate the Jupiter system as an archetype of a gas giant planet and characterise Jupiter’s atmosphere as well as its rings and moons.
SWI is a spectrometer and radiometer, which has two identical channels that measure spectra in the range of 530 µm. It is desirable to reduce the measurable signal wavelength within one channel to 250 µm.
In this way, SWI will be able to
- perform a detailed characterisation of the dynamics and composition of Jupiter’s stratosphere as well as its coupling to the underlying and overlying atmosphere,
- perform in a unique and unprecedented characterisation of the thin atmospheres and exospheres of the Galilean moons; determine their sources and sinks; investigate the interaction with Jupiter’s magnetosphere,
- determine the dominant isotopic ratios in the atmospheres of Jupiter and the Galilean moons, and therefore the origin and evolution of the entire Jupiter system,
- measure the characteristics of the icy moons’ surfaces and subsurface and their composition.