If a massive solar flare is predicted, what specific protective measure can astronauts take against SEPs?

Answer

They retreat to a pre-built, heavily shielded 'storm shelter' within the spacecraft.

Since Solar Energetic Particle events are somewhat predictable via solar monitoring, astronauts can take shelter in specialized, heavily protected areas of the craft until the burst of high-energy particles has passed.

If a massive solar flare is predicted, what specific protective measure can astronauts take against SEPs?

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