The Inouye Solar Telescope Can Now Visualize Eruptions on the Sun’s Surface

Learn how a new instrument will increase the telescope’s ability to spot sunspots in unprecedented detail.

By Paul Smaglik
Apr 24, 2025 8:45 PMApr 24, 2025 9:00 PM
Narrow-band image of the Sun as seen with VTF
A narrow-band image of the Sun at a wavelength of λ=588.9nm, that of a well known solar sodium line also known as the “NaD line.” The image was acquired during recent first light efforts with the VTF at the Inouye, and shows how precisely the structures within a sunspot are resolved. Each pixel in the original version of the image corresponds to 10 km (or 6.2 miles) on the Sun. (Image Credit: © VTF/KIS/NSF/NSO/AURA)

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The most powerful instrument of its kind has now taken its first picture of the sun. Although the Inouye Solar Telescope began operating from its perch on the Hawaiian volcano Haleakala in 2022, the addition of its latest key piece of equipment provides a major boost to its spatial, temporal, and spectral resolution to the most powerful telescope of its kind in the world.

This will increase its ability to visualize eruptions on the sun’s surface. Those storms hurl particles and radiation into space, producing spectacular auroras on Earth — but also can disrupt some technical infrastructure and satellites.

“The Inouye Solar Telescope was designed to study the underlying physics of the Sun as the driver of space weather,” Christoph Keller, director of the National Solar Observatory, which operates the Inouye Solar Telescope, said in a press release.

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