If Solar Flares Pose a Danger to Orbiting Spacecraft and Astronauts

question 61

Multiple Choice

If solar flares pose a danger to orbiting spacecraft and astronauts, how much warning is there for the danger?

• A) The danger is primarily from emission of neutrinos, which move at just below the speed of light; hence the warning is only a few seconds after a feature is observed.
• B) There is no warning; the radiation arrives at the same time as the feature is observed because they all travel at the speed of light.
• C) The primary danger is from high energy particles that travel at the speed of the solar wind 500km/s, so there is ample warning of 3- 5 days.
• D) The danger is from high energy particles moving thousands of km per second, so the warning is a few hours.

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