Radiation Effects

Radiation effects are the ways high-energy particles from the Sun and deep space damage or disrupt electronics in orbit.

Imagine tiny bullets traveling near the speed of light constantly shooting through your computer. Most pass harmlessly through silicon, but some hit in just the wrong way and cause real trouble.

Main Types of Radiation Damage

Total Ionizing Dose (TID)

Over months or years, accumulated radiation slowly degrades transistors and insulators inside chips. It’s like sandpaper gradually wearing down a machine. After enough exposure, components become unreliable, slower, or stop working entirely. This gradual damage is one of the main reasons spacecraft have limited lifetimes.

Single Event Effects (SEE)

A single high-energy particle can flip a bit in memory (called a Single Event Upset), cause a temporary glitch, or in rare cases trigger a latch-up that draws dangerous current until power is cycled. These events happen suddenly and without warning, even on otherwise healthy hardware.

Where the Radiation Comes From

The Sun sends out streams of charged particles during solar flares and coronal mass ejections. Earth’s magnetic field traps many of these particles in the Van Allen belts, creating intense radiation zones that satellites pass through regularly. Beyond Earth’s protection, galactic cosmic rays from outside our solar system add another steady source of high-energy particles.

Even in Low Earth Orbit, radiation levels are significant, especially when passing over the poles. Missions in higher orbits or traveling to the Moon and Mars face much harsher environments.

Why It Matters for Space Computing

Without proper protection, even the best commercial processors would fail within weeks or months in space. Radiation can corrupt important data, crash running software, or permanently damage hardware at any moment.

Engineers must assume that errors will happen and design systems that can detect, correct, or recover from them automatically. This reality influences every other aspect of space computing — from the chips that are chosen to how software is written and tested.

Understanding radiation effects is the essential first step toward building computers that can survive long missions in orbit or travel reliably to other planets.