June 26, 2026• Physics 19, 92 A solar storm hitting Earth appears to have reduced the amount of incoming high-energy cosmic rays, suggesting a new way of measuring solar activity. Storm alert. A coronal mass ejection was recorded by NASA’s Solar Dynamics Observatory June 17–18, 2015. These plasma-spewing events can produce solar storms that travel to Earth. Storm alert. A coronal mass ejection was recorded by NASA’s Solar Dynamics Observatory June 17–18, 2015.