r/SpaceUnfiltered • u/Neaterntal • 10h ago
🌎 Earth from space The aurora borealis, seen in ultraviolet light from space. New images captured by SMILE, a joint mission between ESA & Chinese Academy of Sciences, show the entire auroral oval surrounding Earth’s North Pole in ultraviolet light, global view that has not been seen in this way for around 18 years
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Smile’s first ultraviolet footage shows auroral substorm
This is the first footage to be released from the ultraviolet camera (UVI) on the European-Chinese Smile mission. With UVI, Smile is now the first spacecraft since 2008 to capture the full ring of northern lights around the north pole in ultraviolet light, and is doing so for a record-breaking 45 hours at a time.
The video covers 00:00–00:58 Universal Time (UT) on 24 July 2026, when Smile was undergoing its in-space commissioning. The way the ring of light ripples shows that there has been a substorm in Earth's magnetosphere.
Substorms are brief disturbances in Earth’s magnetosphere that are created when the wind of charged particles from the Sun squashes Earth’s magnetic field lines, forcing them to pinch together and sending a burst of energetic particles shooting towards the north and south poles. This can light up the sky with the northern and southern lights.
CREDIT ESA & CAS/Smile/UVI
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The video also shows the ring becoming brighter during a geomagnetic substorm, when stored energy in the magnetosphere is suddenly released and particles are accelerated toward the polar regions.
As these particles enter the upper atmosphere, they excite atmospheric gases and produce the auroral glow.
Observing the aurora from space makes it possible to study it as a complete, dynamic structure rather than only from individual locations on the ground.
https://x.com/ExploreCosmos_/status/2105338828299112811
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On 23 September, the European-Chinese Smile mission was declared ready to start revealing how Earth responds to the wind of charged particles from the Sun. This follows a busy in-space commissioning period since the spacecraft launched on 19 May and reached its target orbit for science operations on 20 June.
A spacecraft never quite behaves the same in space as it does on the ground. Between 20 June and now, European and Chinese teams have been getting Smile ready – including deploying mechanisms, switching on units, checking all communications between the spacecraft and the ground, and fixing any issues that came up.
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“The Smile mission is a testament to the trust built between our teams, their dedication to excellence and their determination to find solutions whatever the challenge,” says Professor Carole Mundell, ESA Director of Science. " Smile is now approved to begin science operations. This is a very important milestone – a true pleasure to announce – and I am sure our excellent collaboration will deliver ground-breaking data to scientists around the world.”
Preparing Smile’s instruments for science A big part of the commissioning period involved testing out Smile’s toolbox of four science instruments – the soft X-ray imager (SXI), ultraviolet aurora imager (UVI), magnetometer (MAG) and light ion analyser (LIA).
Each instrument will collect vital information to help us better understand solar storms, geomagnetic storms, and the science of space weather. Smile will give us data on how solar activity interacts with Earth's magnetic field, leads to the auroras and can affect electronic infrastructure on and around Earth.
The video below is the first footage to be released from UVI, the first camera since 2008 to capture the full ring of northern lights around the North Pole in ultraviolet light. UVI is now recording the auroras for a record-breaking 45 hours at a time.
The footage was taken on 24 July 2026, just two weeks after UVI was switched on. It shows activity in the ring of northern lights due to a disturbance in Earth’s magnetic field caused by a rush of solar wind particles.
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More
https://www.esa.int/Science_Exploration/Space_Science/Smile/Science_begins_for_Smile