Environment

Beauty of Jupiter’s auroras revealed by Hubble telescope

Huge non-stop lightshow dwarfs the Earth’s transient polar displays, say Nasa scientists

Jupiter appears to be wearing a luminous crown in this Hubble Space Telescope image showing an aurora over one of the planet’s poles. Photograph: NASA/ESA/PA

Sat Jul 2 2016 - 15:23

Astronomers have used the powerful Hubble space telescope to capture images of the luminous auroras that light up the poles of Jupiter.

Jupiter, the largest planet in the solar system, is best known for its colourful storms, the most famous being the Great Red Spot.

Astronomers are now turning their attention to the planet’s poles and observing Jupiter daily over several months to determine how various components of its auroras respond to different conditions in the solar wind, a stream of charged particles ejected from the sun.

Auroras created by high-energy particles are seen on a pole of the planet Jupiter in this Nasa image. Photograph: NASA/ESA/PA

An undated image provided by Nasa of a rendering of the Juno spacecraft passing over Jupiter. After traveling for nearly five years and about 2 billion kilometers, Nasa’s Juno spacecraft is expected to announce its arrival at Jupiter on July 4th, 2016. The New York Times

Auroras are created when high-energy particles enter a planet’s atmosphere near its magnetic poles and collide with atoms of gas.

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Jupiter’s auroras are huge and hundreds of times more energetic than auroras on Earth - and they never stop, thanks to the planet’s strong magnetic field.

A statement from Nasa said the new observations and measurements would help to better explain how the sun and other sources influence auroras.

The images were released as Nasa’s Juno spacecraft hurtled closer toward the solar system’s largest planet, where it will spend a year analysing how Jupiter formed and helped set the stage for life on Earth.

"These auroras are very dramatic and among the most active I have ever seen," said Jonathan Nichols from the University of Leicester, UK, and principal investigator of the study.

“It almost seems as if Jupiter is throwing a firework party for the imminent arrival of Juno.”

During a 20-month study Juno is expected to circle the gas giant in 37 egg-shaped orbits to measure microwaves radiating from inside the planet’s thick atmosphere, map its massive magnetic field and conduct other experiments.

Scientists are particularly keen to learn how much water Jupiter contains, a key to unlocking the origins of the largest celestial body in the solar system after the sun.

The Guardian

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