Re: Why They Use Ionospheric Heaters (HAARP, EISCAT, etc.)
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Schumann Resonances are also about 100 km high. On Ionosphere too, about 120km high, there a good temperature for life like down here on soil. Above 130 km, on thermosphere, temperature began to rise quickly....If you want to 'play', try from 100km to 120km. Above that..., looks dangerous: Van Allen belt, Sun and planets paths (meteors too?) about 3000km must be even more deadly enviroment. The celestial sphere, inside, about 5000km high, must have a glass container too with high radiation inside.