Radio shields

Dr. Takahashi:

It is a wonderful and refreshing thing to have such high quality
submissions to this list. Thanks!

Ron

"yukiastro" yukimoon@...
04/28/03 05:20 PM

Dear Mr. Charles Radley,

Thank you very much for taking your time to look at my work. I had not
known
about the Space Studies Institute, but am happy that we have common
interests. Thank you for inviting me to join the discussion.

I have not come across any analysis on space-based radio shield yet...
From my understanding (i'm still a beginner in this field), i'd guess that
the
thickness of the shield should go up as the square-root of the observing
wavelength. For example, using an aluminum shield, attennuating a 100-
MHz wave by N orders of magnitude in power will require a thickness of
~8*N
micron. Anyhow, for frequencies below 30 MHz (wavelengths over 10 m), a
single dish (even a 100-meter one) will not provide very useful angular
resolutions.

My proposal in view of the high cost of building a telescope on the lunar
far
side is to begin with a precursor observatory at the lunar south pole.
Please
see
http://panic.millennium.berkeley.edu/~yukimoon/Takahashi-VLFA.doc

I would really appreciate any feedback and suggestions from you.
Especially if you are in California, I hope to meet you soon!
Sincerely,
Yuki

* * Yuki D. Takahashi + +
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