"It is the global geomagnetic activity index based on 3-hour measurements ... when viewed in extreme ultraviolet and soft X-ray solar images. Like sunspots, they appear darker because they are ...

Fast solar wind from a massive coronal hole in the sun could trigger dazzling auroral displays as geomagnetic activity is ...

We look ahead to 2025 as the sun ramps up its activity, driven by the peak of the current solar cycle. 2024 was a busy year for solar news, but what can we expect from 2025? In April, a total ...

The National Oceanic and Atmospheric Administration said a strong geomagnetic storm may cause an unusually bright northern ...