I´m debating with a guy that went to NOAA database and found that, according to Helen Dodson Prince classification, there were a bunch of "significant", "important" and "major" flares during Apollo missions and, therefore, the astronauts should have suffered radiation sickness.

I wonder if the word "significant" means the same thing to people who were researching flares and to people who were trying to survive them. I also wonder why US government would let NOAA to calmly expose those data to public access if it were evidence of a fraud, and why no astrophysicist ever noticed or talked about that.

I have an entrenched, science-illiterate HB that likes to read high-level stuff here and there, but will never ask questions or try to confirm his findings with specialists. Naturally, every misunderstanding becomes an "evidence" and it won´t accept apeals to common sense as an answer.

I would like to learn more about the matter to write a direct answer. Could anyone help me?

None of those criteria address biological factors. "Significance" is subjective. What is significant according to one standard (e.g., disruption of radio communications) may be completely negligible by other standards (e.g., astronaut exposure). If you want to apply the data to biological questions, you must have standards that specifically speak to biological exposure.

Is there an observatory or a planetarium near you? Those are frequently the best references for this type of data.

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What is the type of this information? Were they able to measure proton fluxes at this time. Did they calculated that using other indirect ways?

I was listening to an archive recording of The Connection Where Phil appeared alongside Oberg and Rene

Rene mentions a book by John H Molden, "Prospects for Interstella Travel" and on page 225 says how lethal solar flares are (Not really up to transcribing it), ressurecting the radiation issue.

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I would like to see those often quoted texts just to read what they exactly mean.