Solar radiation

I have a question :

How far away from the sun would you have to be, before open-space
radiation levels would be as low as those at the Earth's surface?
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)

On 5 Dec, 08:21, Paul Hyett wrote:
I have a question :

How far away from the sun would you have to be, before open-space
radiation levels would be as low as those at the Earth's surface?
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)

That's an interesting question I do not have the answer to but, there
are several factors involved in solving your query. The earth
benefits of two attenuating factors. First is the magnetic shield
which deflects the solar wind sheltering us from direct damaging
effects. Any residual effects are highlighted daily by auroral glows
at the poles. Second is the atmospheric shield. I know that cosmic
rays coming through the magnetic shield are deccelerated by collisions
with atmospheric atoms/molecules and decay into energetic electron
showers (muons). The atmosphere also takes care of any hard solar
radiation (U-V).
Then, there is the inverse square law which means that the further out
you are, the more mitigated the effects will be. It must come a point/
distance in space where the flux from the Sun is in equilibrium with
the interstellar field. Whether this would be as low as what we
encounter on Earth, I don't know. Maybe, somebody else will come in
and fill the gaps in my reasoning.
Pierre