JADE, the Jovian Auroral Dynamics Experiment,
is a set of instruments that measures the electrons and ions
those are particles, very tiny charged particles,
that are parts of an atom.
And those particles actually produce the aurora.
They follow along the magnetic field lines
and they come down into the atmosphere of Jupiter
and they excite different sorts of interactions that
that emit light, different wavelengths of light.
Those we observe as the aurora.
But the aurora's really caused by these tiny, tiny particles
coming down into the atmosphere.
And JADE actually measures those individual particles.
There are three identical electron sensors,
and they look off in three different directions
around the belly-band of the spacecraft
so that they've got a broad field of view
120 degrees wide
so the three of them actually can see all the way around the spacecraft all of the time.
The JADE Ion instrument is different.
It actually has a thing that looks a little bit more like a hamster wheel
in a hamster cage.
And that's to allow particles to come in over 270 degrees
of observing angle
and twice per minute the Juno spacecraft spins around
and that allows that field of view to observe all of space.
And so we're trying to understand what's the same and different between our own aurora
and the aurora of Jupiter, so that we can understand the processes really in detail for the first time.
We'll be fully successful, and we can come back and tell the world
how it really works, what particles are involved, and why.