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Home Science & Environment

See the sun revealed in stunning glory by Solar Orbiter pictures

November 20, 2024
in Science & Environment
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The sun’s upper atmosphere, or corona, in ultraviolet light

ESA & NASA/Solar Orbiter/EUI Team

These fiery images are the clearest views we have ever had of the sun, taken by the Solar Orbiter spacecraft.

Solar Orbiter, a joint mission between the European Space Agency (ESA) and NASA, is the most advanced instrument to orbit the sun and has been sending back information to Earth since it arrived there in 2020.

These images were captured in March 2023, when Solar Orbiter was less than 74 million kilometres from the sun. The picture above was taken using ultraviolet light, revealing the sunâ€s outer atmosphere, or corona, in extreme detail and showing the roiling, 1 million °C plasma blasting out along the sunâ€s magnetic field lines. The bright light from the sun’s surface normally hides the corona, so the corona can normally only been seen if you block out visible light, which happens during an eclipse, or just look using ultraviolet light, say.

To create this full image of the sunâ€s corona, many smaller zoomed-in pictures had to be stitched together, resulting in this full mosaic consisting of 8000 pixels. In the future, we will get two high-resolution pictures of the sun like this from the Solar Orbiter each year, according to ESA.

The sun in visible light taken by the Polarimetric and Helioseismic Imager on the Solar Orbiter spacecraft

ESA & NASA/Solar Orbiter/PHI Team

This second image is what the surface, or photosphere, of the sun looks like when viewed by the Solar Orbiter in visible light, the same light we can see with our eyes. This layer of the sun has a temperature of between about 4500 and 6000°C. The dark regions here are sunspots, which are cooler than the surrounding areas and emit less light.

A map of the sun’s magnetic field as measured by the Polarimetric and Helioseismic Imager on the Solar Orbiter spacecraft

ESA & NASA/Solar Orbiter/PHI Team

When viewed using the spacecraftâ€s magnetic instruments, the sunâ€s magnetic field can be seen to be concentrated around the sunspot regions (see image above). The field directs charged particles away from these regions, cooling them down and giving them their dark appearance.

A velocity map, or tachogram, showing the speed and direction of movement of material at the sun’s visible surface

ESA & NASA/Solar Orbiter/PHI Team

The Solar Orbiter can also track the speed and direction of the plasma moving at the sunâ€s surface. In this velocity map (above), called a tachogram, blue represents movement towards the spacecraft and red away from it, showing that the plasma mostly turns with the spin of the sun, but diverges around the sunspot regions.

This collection of images will help scientists understand the behaviour of the sunâ€s corona and photosphere. The Solar Orbiter will also image the sunâ€s poles, on the top and bottom of the star, which we havenâ€t seen before. We donâ€t currently understand the solar poles well and researchers expect these areas to look markedly different from the other regions of the sun.

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