NASA's Astronomy Picture of the Day for October 31, 2026 presents a nighttime view of Hverir, a geothermally active area in northeastern Iceland's volcanic landscape. The image is credited to Stéphane Vetter, with Jerry Bonnell, Cecilia Chirenti, Robert Nemiroff and Keighley Rockcliffe listed as authors and editors.

According to the accompanying explanation, geomagnetic storms triggered by solar activity sent energetic particles trapped in Earth's magnetic field into the upper atmosphere at high latitudes, producing auroral displays. In the scene, towers of steam and gas venting from local fumaroles appear against the greenish northern lights and a starry sky.

The explanation adds that auroral activity on Earth remains high while the Sun is only in the early phases of decline from the peak of its solar activity cycle. The next day's APOD entry was listed as "Colors of the Moon."