That is a rare capture, and very interesting. You are presenting a pretty small target cross sectional area to get such a narrow angle strike.
I sometimes see a "particle shower" in the dark areas on the odd frame,
but that is always the debris of a front-on event, so much less rare.
From my days long in the past designing CMOS memory, we would be most concerned about alpha particles, they had the potential to liberate the most charge and upset a storage cell. Ironically, one of the most frequent sources was not cosmic rays, but the ceramic in some IC packages itself!
-Ivan
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