WEBVTT

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JADE, the Jovian Auroral Dynamics Experiment,

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is a set of instruments that measures the electrons and ions

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those are particles, very tiny charged particles,

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that are parts of an atom.

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And those particles actually produce the aurora.

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They follow along the magnetic field lines

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and they come down into the atmosphere of Jupiter

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and they excite different sorts of interactions that

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that emit light, different wavelengths of light.

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Those we observe as the aurora.

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But the aurora's really caused by these tiny, tiny particles

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coming down into the atmosphere.

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And JADE actually measures those individual particles.

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There are three identical electron sensors,

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and they look off in three different directions

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around the belly-band of the spacecraft

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so that they've got a broad field of view

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120 degrees wide

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so the three of them actually can see all the way around the spacecraft all of the time.

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The JADE Ion instrument is different.

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It actually has a thing that looks a little bit more like a hamster wheel

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in a hamster cage.

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And that's to allow particles to come in over 270 degrees

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of observing angle

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and twice per minute the Juno spacecraft spins around

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and that allows that field of view to observe all of space.

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And so we're trying to understand what's the same and different between our own aurora

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and the aurora of Jupiter, so that we can understand the processes really in detail for the first time.

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We'll be fully successful, and we can come back and tell the world

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how it really works, what particles are involved, and why.