What distinguishes Solar Particle Events (SPEs) from GCRs in terms of astronaut danger?

Answer

SPEs pose an acute danger by delivering a massive radiation dose very quickly.

While GCRs are a long-term hazard, Solar Particle Events (SPEs) are sudden, massive bursts of energetic particles that can deliver a lethal dose rapidly to an unshielded astronaut.

What distinguishes Solar Particle Events (SPEs) from GCRs in terms of astronaut danger?
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