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The Inouye Solar Telescope in Hawaii has captured the highest-resolution visible-light image of the Sun to date, confirming the presence of Kelvin-Helmholtz instability (KHI) on the solar surface. This phenomenon creates wave-like patterns and swirls where streams of solar magnetic plasma flow past each other at different speeds. The image, spanning approximately Earth's radius with city-sized detail resolution, reveals KHI formations particularly along the edges of granular structures on the Sun's surface.
Why it matters
Understanding Kelvin-Helmholtz instability on the Sun could help scientists explain how energy and magnetic fields are transported through solar plasma and potentially how the solar corona is heated to millions of degrees. This enhanced imaging capability enables direct observation of previously theoretical solar processes that affect space weather and solar dynamics.
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APOD
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New Sharpest Image of the Sun Uncovers Instability
Explanation: What does the new sharpest image of our Sun show? Instability. To be clear, a certain kind of interactive process called the Kelvin-Helmholtz instability (KHI). This instability can create waves and swirls when two streams flow past each other — in this case variable streams of solar magnetic plasma. Long hypothesized to occur on the Sun’s surface, KHI streaks and swirls were confirmed in just-released dramatic high-resolution images taken recently by the Inouye Solar Telescope in Hawaii, USA. The featured false-yellow image, actually taken in deep blue, is the highest resolution image yet of the Sun in visible light. It spans about the radius of the Earth, but its finest details are city sized. Visible are several smooth tops of changing solar granules, while the edges of the flower-like structures have been found to harbor multiple KHI swirls. Future research may investigate how the KHI helps move energy, magnetic fields, and may even heat the surrounding solar corona.
Tomorrow’s picture: Rubin’s COSMOS
| Date | August 6, 2026 |
|---|---|
| Credit | NSF, NSO, AURA, MPS, Inouye Tel |
| Authors & editors: | Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |
Source: APOD: 2026 August 6 – New Sharpest Image of the Sun Uncovers Instability