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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

See Explanation. Clicking on the picture will download the highest resolution version available.

Aurora over Jupiter's South Pole from Juno

Explanation: Why is there a glowing oval over Jupiter's South Pole? Aurora. Near the closest part of its first pass near Jupiter in August, NASA's robotic spacecraft Juno captured this dramatic infrared image of a bright auroral ring . Auroras are caused by high energy particles from the Sun interacting with a planet's magnetic field, and ovals around magnetic poles are common. Data from Juno are giving preliminary indications that Jupiter's magnetic field and aurorae are unexpectedly powerful and complex . Unfortunately, a computer glitch caused Juno to go into safe mode during its October pass near the Jovian giant in October. That glitch has now been resolved, making Juno ready for its next pass over Jupiter's cloud tops this coming Sunday.

Date December 6, 2016
Credit Image Credit: NASA , JPL-Caltech , SwRI , ASI , INAF , JIRAM
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.