I guess in a dark room you usually have some kind of matter between the
sky and your tube thus diminishing the rate of ionizing radiation.
But yes, some parts of this ionizing radiation are caused by protons and
alpha particles that arrive here from the sun at decently high energies.
They cause particle showers in our atmosphere and those particles then
pre-ionize our beloved Nixie tubes. Naturally, when earth is blocking
the way, those primary solar particles cannot reach us, and all we are
left with is the rest of cosmic rays that will most probably not do the
job at all times.
Jens
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