See the Sun’s surface in higher detail than ever before in new telescope images

The Daniel K. Inouye Solar Telescope (DKIST), situated on the Hawaiian island of Maui, has unveiled the most detailed images of the Sun's surface to date. This breakthrough was made possible by the telescope's four-meter mirror, advanced optics, and high-speed cameras that can resolve features as small as 20 kilometers across. These unprecedented images, published in the journal Nature, have revealed a previously unseen phenomenon – the Kelvin–Helmholtz instability – on the Sun's surface.

The Sun's magnetic field plays a crucial role in driving space weather, which can disrupt satellites, power grids, and communications on Earth. The Sun's surface is significantly cooler than its core, yet the corona, which extends above the surface, reaches millions of degrees. Understanding the mechanisms responsible for this dramatic temperature change is essential for predicting space weather and interpreting the magnetic activity of distant stars.

On the Sun's surface, roiling flows of plasma interact with magnetic fields, leading to the formation of magnetic sunspots or their twisting and tangling. These surface magnetic fields extend into the corona, causing magnetic fields aloft to snap and reconnect, releasing energy in the form of heat and fast flows. This process can sometimes trigger explosive solar flares.

The new observations from DKIST have provided the first clear evidence of the Kelvin–Helmholtz instability on the Sun's surface. This phenomenon, previously theorized but never observed, occurs when fast fluid slides past slower fluid, creating wave-like billows like those seen in wind-swept clouds. By combining DKIST data with computer simulations, researchers have identified the role of these instabilities in mixing plasma and braiding magnetic fields, which is likely to pump energy upward and contribute to the corona's extreme temperatures and explosive flares.