home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: alt.pagan
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!usc!cs.utexas.edu!natinst.com!radian!markbr
- From: markbr%radian@natinst.com (markbr)
- Subject: Re: Space, the final frontier
- Sender: usenet@radian.uucp (Usenet login for mail routing)
- Message-ID: <1992Dec30.183350.20005@radian.uucp>
- Date: Wed, 30 Dec 1992 18:33:50 GMT
- References: <gate.w9PNVB1w165w@pil.UUCP> <1992Dec29.164215.19718@nntpd.lkg.dec.com>
- Nntp-Posting-Host: zippy.radian.com
- Organization: n.o.y.b
- Lines: 38
-
- In article <1992Dec29.164215.19718@nntpd.lkg.dec.com> boylan@ljohub.enet.dec.com (Steve Boylan) writes:
- >
- >Oh, why not join this happy mutual grilling?
- >
- >One item that keeps popping up in this thread is the idea of
- >getting cheap, clean electricity from orbiting power satellites.
- >
- >Not to be a spoilsport, but . . .
- >
- >What power density is necessary to transfer, say, 25% of North
- >America's power needs from orbiting satellites to Earth-based
- >power receivers?
- >
- >What frequencies are most efficient for power transfers from
- >orbit to the Earth's surface?
-
- To give semi-answers to the first two, about 10 years ago I heard a
- speaker from the Space Sciences Institute (a not-for-profit org), who
- said that a *number* of studies, incl. environmental impact statements,
- had been done on this. They were talking of microwaves, and braodcasting
- to desert receivers, and a power density of 6W/meter^2. Yes, I said 6 *watts*
- per square meter (sorry not enough to heat water for coffee, much less fry
- buzzards & other locals).
- >
- >How much microwave radiation does that expose people to?
- >
- >How does that compare with current microwave exposure levels?
- >
- >Based on our current understanding of the effects of microwave
- >radiation on human beings, what health hazards would this pose?
- >
- >What level of health hazard would you consider acceptable?
- >
- And how would it compare with the health risks posed by the "conventional"
- power sources (gases from coal or nat. gas, radiation from nuclear)?
- >
- mark
-
-