NASA Solarsystem Collection

Alice Views Jupiter and Io

This graphic illustrates the pointing and shows the data from one of many observations made by the New Horizons Alice ultraviolet spectrometer (UVS) instrument during the Pluto-bound spacecraft's recent encounter with Jupiter. The red lines in the graphic show the scale, orientation, and position of the combined "box and slot" field of view of the Alice UVS during this observation.

The positions of Jupiter's volcanic moon, Io, the torus of ionized gas from Io, and Jupiter are shown relative to the Alice field of view. Like a prism, the spectrometer separates light from these targets into its constituent wavelengths.

Io's volcanoes produce an extremely tenuous atmosphere made up primarily of sulfur dioxide gas, which, in the harsh plasma environment at Io, breaks down into its component sulfur and oxygen atoms. Alice observed the auroral glow from these atoms in Io's atmosphere and their ionized counterparts in the Io torus.

Io's dayside is deliberately overexposed to bring out faint details in the plumes and on the moon's night side. The continuing eruption of the volcano Tvashtar, at the 1 o'clock position, produces an enormous plume roughly 330 kilometers (200 miles) high, which is illuminated both by sunlight and "Jupiter light."

Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

04.04.2007

Solar System Exploration

SSE

Space

NASA

National Aeronautics and Space Administration

JPL

Jet Propulsion Laboratory

Planets

Moon

Jupiter

Pluto

Io

New Horizons

Spectrometer

Alice Ultraviolet Spectrometer

UVS

Jet Propulsion Laboratory

Jupiter

Pluto

Jet Propulsion Laboratory (JPL)

04-04-2007

2007

SPD-SLRSY-5003

http://solarsystem.…