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Effects Observable in a Satellite
About 10 satellites, in suitably spaced orbits about 1000 miles
high, could keep the whole earth under surveillance. ° cisreercssses thst
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III. Importance of Effects Tests at High Altitude
In the foregoing it has been shownthat high altitude is not a
good place to "hide" a weapons development test. On the other hand,
the phenomena at high altitude are themselves very interesting for
military applications, and some consequences for civilian communications. Only rather fragmentary knowledge on these phenomena will
exist after HARDTACK even if the tests are successful, especially
because there has not been enough time to prepare instrumentation for
the tests. It therefore seems important to conduct further high altitude
tests even if these are not directed toward weapons development. A
moratorium might provide for such tests to be carried out with stockpile bombs.
Among the important problerns are (1) Project Sunlamp, i.e.
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emission and propagation of nuclear radiation from the weapon,
(2) electromagnetic, visible light and X-radiation, (3) heat and shock
waves, (4) radio and radar blackouts, (5) disturbance of the ionosphere
and the ozone layer, (6) the fission product cloud and the radar blackout produced by it, and (7) the Argus effects.
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There could be further effects due to the
Argus phenomena, and these might be even larger and of much longer
duration.
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From explosions above 200,000 feet, appreciable X-rays
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sea level, and could serve as a measure of yield, with the altitude
deduced from a combination of light with gamma-ray and neutron
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