Solar Orbiter gives scientists unprecedented look at Sun

Patrick Galey, Agence France-Presse

Posted at Jul 16 2020 11:02 PM

Scientists said Thursday they had obtained the closest ever images taken of the Sun as part of a pan-European mission to study solar winds and flares that could have far-reaching impacts back on Earth.

The European Space Agency's Solar Orbiter blasted off from Florida's Cape Canaveral in February and completed its first fly by of our star last month, sending back unprecedented images of phenomena close to its surface.

 
 
 
 
 
 
 
 
 
 
 
 
 

The Sun will shine tomorrow like never before‼️ ☀️ ⠀⠀⠀⠀⠀ Join us on Thursday 16 July for an online press briefing with Solar Orbiter mission experts, who will present the first images from our new Sun-observing spacecraft. ⠀⠀⠀⠀⠀ The first images are unique – no other images of the Sun have been taken from such a close distance – and are already exceeding the expectations of the scientists. ⠀⠀⠀⠀⠀ During its first perihelion, the point in the spacecraft’s elliptical orbit closest to the Sun, in June, Solar Orbiter got as close as 77 million kilometres from the star’s surface, about half the distance between the Sun and Earth. The spacecraft will eventually make much closer approaches to the Sun. ⠀⠀⠀⠀⠀ Solar Orbiter's first images will be released to the public during the online press briefing starting at 14:00 CEST (13:00 BST; 08:00 EDT) on 16 July. ⠀⠀⠀⠀⠀ Watch live on esawebtv.esa.int ⠀⠀⠀⠀⠀ 📸 @europeanspaceagency / IPEV / PNRA - A. Kumar 🖥 @europeanspaceagency ⠀⠀⠀⠀⠀

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"The first images are exceeding our expectations," said Daniel Muller, Solar Orbiter project scientist at ESA.

"We can already see hints of very interesting phenomena that we have not been able to observe in detail before.

"This makes us confident that Solar Orbiter will help us answer profound open questions about the Sun."

In particular, the team observed dozens of miniature solar flares, known as "campfires", which until now had never been captured on film.

David Berghmans, from Belgium's Royal Observatory, said the campfires were several million times smaller than solar flares, which can be observed from Earth.

Nevertheless, the smallest the team observed still measured around 400 kilometres across -- "about the size of a small European country," said Berghmans.

"The Sun seems relatively calm on first viewing but when you look at it in detail you can see miniature eruptions everywhere," he added.

Solar winds and flares emit billions of highly charged particles that impact planets, including Earth. But the phenomena remain poorly understood despite decades of research.

The largest solar storm on record hit North America in September 1859, knocking out much of the continent's telegraph network and bathing the skies in an aurora viewable as far away as the Caribbean. 

Solar ejections can also disrupt radar systems, radio networks and can even render satellites useless, though such extremes are rare. 

During its first orbit, the craft -- developed in conjunction with NASA -- travelled around 77 million kilometres (48 million miles) from the surface, about half the distance between the Sun and Earth. 

Equipped to withstand temperatures as high as 500 degrees Celsius (930 Fahrenheit), it will eventually travel as close as 40 million kilometres from the surface, protecting its instruments with a heat-resistant structure that will be exposed to sunlight 13 times stronger than on Earth.

- 'Terra incognita' -

Its operators plan to gradually tilt the craft's orbit, enabling scientists to obtain the first ever images of the Sun's poles.

Sami Solanki, director of the Max Planck Institute for Solar System Research, said the team was especially excited about images of the Sun's poles, which he described as "terra incognita".

The Solar Orbiter mission and is set to last up to nine years at a cost of some 1.5 billion euros ($1.7 billion).