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RE: Solar energy.... Japan launches study on space...
If I remember correctly, they were discussing microwaves of on the order of
1.3 MHz frequency back 20 or so years ago. Also the original concept was to
make use of an active transmitter receiving antenna array, which would
monitor the power flow. In this system, the tranmitter antenna would adapt
itself to minimize power losses (I don't remember the details anymore) and
if necessary take itself off line.
>From: "Christoph Hofmeyr" <chofmeyr@nnr.co.za>
>Reply-To: "Christoph Hofmeyr" <chofmeyr@nnr.co.za>
>To: "Bjorn Cedervall" <bcradsafers@HOTMAIL.COM>
>CC: <radsafe@list.vanderbilt.edu>
>Subject: RE: Solar energy.... Japan launches study on space...
>Date: Mon, 9 Jul 2001 15:42:20 +0200
>
>Bjorn, Radsafers,
>I suggested to Sandy that they might be missing a million, and he agreed
>that there could have been a mistake. I think the principle is to use a
>well-focused MASER to transmit the energy from an earth-synchronous
>satellite to a well-defined aerial on earth. A pilot laser beam from
>the earth station can have control in case the satellite is destabilised
>by e.g. a micro-meteorite, in which case the Maser beam would have to be
>deflected away - we do not want to be micro-waved by a gigawatt, even if
>it is non-ionising radiation!
>Own thoughts.
>Chris Hofmeyr
>chofmeyr@nnr.co.za
>
>
>-----Original Message-----
>From: Bjorn Cedervall [mailto:bcradsafers@HOTMAIL.COM]
>Sent: Monday, July 09, 2001 12:49 PM
>To: radsafe@list.vanderbilt.edu
>Subject: Solar energy.... Japan launches study on space...
>
>
>The text below dropped in via Sandy - can anyone confirm regarding the
>1-kilowatt capacity/satellite. It doesn't sound much (?) - 1 000 to 10
>000
>MWe would have seemed more reasonable. I am also interested in this
>topic
>since a success could mean that we will put the Earth into focus of a
>"magnifying glass" (numerous satellites). Animals and other organisms
>may
>vanish in "both ends" (not enough with cold for high altitude or
>(ant)arctic
>animals&plants, overheating of those which live in hot areas today). OK
>-
>this solar radiation idea is perhaps too off-topic so please send the
>"non-radiation" comments to me directly - rather than to the group.
>
>Bjorn Cedervall bcradsafers@hotmail.com
>-----------------------------------------
>Japan launches study on space solar power as energy source
>
>TOKYO, July 3 (Kyodo) - The Ministry of Economy, Trade and Industry
>(METI) said Tuesday it has launched a two-year feasibility study on
>developing solar power in space as an alternative source of energy.
>
>The ministry aims to realize by 2040 a system of power generation
>using satellites that can send electricity to Earth by microwaves.
>
>Each satellite would have a 1-kilowatt capacity, equivalent to power
>generation by a nuclear plant, a ministry official said.
>
>The envisaged system will also be 10 times more efficient than solar
>power systems on Earth because of its indifference to sunlight and
>will emit no heat-trapping carbon dioxide, METI said.
><snip>
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