A New Look at Space Radiation Near Earth

By Space.Fan Editorial DeskSeptember 27, 2026 at 2:03 AM UTC

Scientists used a special sensor on a satellite to measure cosmic particles hitting our planet during a quiet time for the Sun.

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The Drop

Space is full of tiny particles traveling at high speeds called cosmic rays. These particles come from deep space, but our Sun affects how they reach us. When the Sun is very active, its magnetic field acts like a shield, blocking many of these rays. When the Sun is quiet, more of these particles can get through. To study this, scientists used a tool called the High-Energy Particle Detector on a Chinese satellite named CSES-01. Launched in 2018, this device is small but powerful. It is perfect for counting tiny bits of matter called protons and helium nuclei that fly through space. The team looked at data collected when the Sun was at its quietest point in its 11-year cycle. They focused on helium particles moving at specific energy levels. These levels are usually hard for satellites in low Earth orbit to measure accurately. By catching these particles, the team gained a better view of how cosmic rays interact with the environment near our . Finally, the researchers compared their results to math models that predict how particles move through space. This helps check if our current theories about cosmic radiation match what is actually happening in the space surrounding Earth.

Why It Matters

Understanding how these cosmic particles behave helps us learn about where they come from in the distant universe. Because these particles can affect technology and even human health in space, tracking them accurately is vital for planning future space missions. By filling in the gaps in our data, scientists can create better models to protect astronauts and sensitive electronics.

The Catch

The study only looked at a small range of particle energy levels. Because space is a huge and complex environment, these findings might not perfectly describe what happens at much higher or lower energy levels. The results also rely on math models that are based on our current best guesses, which could change as we get more precise data from newer instruments.

Put That in Perspective

Scientists have tracked cosmic rays for decades, but getting accurate data from this specific energy range is difficult because the Earth's magnetic field gets in the way. This new work provides a fresh piece of the puzzle that helps connect older ground-based observations with high-altitude satellite data.

Source September 27, 2026

ApJ