NASA observes Sun's corona during August 12 total solar eclipse

A total solar eclipse will sweep across Greenland, Iceland, and parts of Canada on Wednesday, Aug. 12, offering a rare celestial event that will darken daytime skies and expose the Sun’s faint outer atmosphere, the corona. The eclipse’s path of totality will be roughly 1,200 km wide, with a maximum duration of about 2 minutes and 30 seconds near the northernmost point of the track. The event is expected to attract both amateur skywatchers and professional scientists who will take advantage of the brief, unobstructed view of the corona to study the Sun’s magnetic field and the mechanisms that drive the solar wind.

Scientists plan to deploy a combination of space‑borne and ground‑based instruments during the eclipse. NASA’s Solar Dynamics Observatory and the European Space Agency’s Solar Orbiter will provide high‑resolution imaging of coronal loops and flare activity, while a network of ground‑based coronagraphs will measure the density and temperature of the coronal plasma. Researchers also aim to use the eclipse to test models of solar magnetism and to refine predictions of space‑weather events that can impact satellite communications and power grids on Earth. The data collected during this eclipse will feed into long‑term studies of solar variability and its effects on the near‑Earth environment.

As the Sun’s light is momentarily blocked, the sky will take on a twilight hue, and observers along the eclipse path will witness the corona’s delicate, filamentary structure. The Aug. 12 eclipse not only provides a spectacular visual display but also serves as a critical laboratory for probing the Sun’s outer layers, improving our understanding of solar dynamics and their influence on the planet.