Notionally,
the cause of
bit rot. However, this is a
semi-independent usage
that may be invoked as a humorous way
to
handwave away any minor
randomness that doesn't seem
worth
the bother of investigating. "Hey, Eric - I just got
a burst of garbage on my
tube, where did
that come from?"
"
Cosmic rays, I guess." Compare
sunspots, {phase of
the
moon}.
The British seem to prefer
the usage "
cosmic showers";
"alpha particles" is also heard, because stray alpha particles
passing through a memory chip can cause single bit errors
(this becomes increasingly more likely as memory sizes and
densities increase).
Factual note: Alpha particles cause bit rot,
cosmic rays do
not (except occasionally in spaceborne computers). Intel
could not explain random bit drops in their early chips, and
one hypothesis was
cosmic rays. So they created
the World's
Largest Lead Safe, using 25 tons of
the stuff, and used two
identical boards for testing. One was placed in
the safe, one
outside.
The hypothesis was
that if
cosmic rays were causing
the bit drops, they should see a statistically significant
difference between
the error rates on
the two boards. They
did not observe such a difference. Further investigation
demonstrated conclusively
that the bit drops were due to alpha
particle emissions from thorium (and to a much lesser degree
uranium) in
the encapsulation material. Since it is
impossible to eliminate these radioactives (they are uniformly
distributed through
the earth's crust, with
the statistically
insignificant exception of uranium lodes) it became obvious
that one has to design memories to withstand these hits.
[
Jargon File]