4. Io Ra Patera
Crescent and Plume

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This image shows a new volcanic plume rising about 100 kilometers (about 60 miles) above Jupiter's moon Io (see lower left inset ). The plume is thought to consist of sulfur dioxide gas and "snow" precipitating as the gasplume expands and cools.Galileo images also show that theRa Patera plume glows in the dark, perhaps due to the fluorescence of sulfur and oxygen atoms excited by energetic particles in the Jovian magnetosphere. P-47194

D = 972,000 km
Res= 10 km
Size = 250 x 150 km
Centered at 3° N 227°W

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