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We have noticed auroras on Neptune for the primary time

March 28, 2025
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We have noticed auroras on Neptune for the primary time
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Inexperienced blotches present the place auroras mild up Neptune’s skies

NASA, ESA, CSA, STScI, Heidi Hammel (AURA), Henrik Melin (Northumbria College), Leigh Fletcher (College of Leicester), Stefanie Milam (NASA-GSFC)

For the primary time, researchers have noticed infrared auroras swirling in Neptune’s environment, verifying many years of scientific hypothesis.

When NASA’s Voyager 2 mission flew by Neptune in 1989, it discovered tantalising hints of aurora exercise within the ice large’s clouds. Nonetheless, scientists have been unable to confirm the phenomenon on the time, as current devices have been too weak. Now, the James Webb Area Telescope (JWST) has lastly supplied the facility to detect them.

“This was actually a success of years’ price of anticipation,” says Heidi Hammel on the Affiliation of Universities for Analysis in Astronomy in Washington DC.

Hammel and her colleagues used JWST’s NIRSpec, a robust infrared imaging device, to seize spectroscopic photographs of Neptune and analyse the totally different wavelengths of sunshine emitted by the planet. In 2023, researchers used the instrument to detect infrared auroras on Uranus. This time, it discovered them on Neptune as properly.

The pictures additionally allowed Hammel and her group to start developing a map of Neptune’s magnetic area. That is notably thrilling because the planet is understood to have a number of the most uncommon magnetic poles within the photo voltaic system.

Not like Earth, Jupiter or Saturn, Neptune’s magnetic poles aren’t centred at its rotational poles. As an alternative, “they’re offset by virtually half the planet’s radius”, says Hammel. Consequently, its auroras seem as irregular blobs a lot nearer to its equator, over roughly the area the place South America sits on Earth.

Along with detecting auroras, the JWST observations point out that Neptune’s ionosphere – the layer of charged particles blanketing some planets – is cooling down. It’s now, on common, about 10 per cent colder than when Voyager 2 handed by practically 36 years in the past. Related adjustments have been detected on Uranus.

Whereas the authors of the brand new research aren’t certain why this cooling occurred, they hope their subsequent JWST remark interval, scheduled for 2026, will provide extra clues.

Abisko aurora sky station with Northern lights above, Abisko National Park, Sweden

Science of astronomy and ice: Sweden

From putting alpine forests to picturesque snowcapped mountains, travelling to northern Sweden throughout the winter months gives a very magical expertise.

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