On Aug 19, 2011, at 5:37 PM, [email protected] wrote:
I don't know why NASA say this. I believe that our high power
directional radar emissions would be very detectable and we need
not worry about atmospheric signatures.
Frank Z
Hi Frank,
Using a mean earth diameter of 6371 km, a mean albedo of 0.3, and
solar insolation of 1 W/m^2, we have a reflected power of:
P = (6.371x10^6 m)^2 * Pi * 0.3 * (1 W/m^2) = 3.8x10^13 W
HAARP type transmitters around the world radiate at an order of a GW,
or 10^9 W, but are directional and intermittent. The narrow
bandwidth helps compensate for the 4 orders of magnitude difference,
however.
We currently have the ability to find extrasolar planets, and look at
their spectra and temperatures, so we should expect more advanced
civilizations to have similar capabilities and programs to monitor
nearby worlds, especially those having liquid water.
All this is food for thought ...
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
