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" ... Container consists of 144 antennas spread across 1,300 yards. It bounces radar waves off the ionosphere, giving it a detection range of no less than 1,900 miles. Crimea is around 900 miles from Moscow. ... "
" ... SunRISE will consist of a constellation of six CubeSats which would fly within about 10 km of each other and image the Sun in a portion of the spectrum blocked by Earth’s ionosphere, the authors of a 2019 IEEE paper describing the project write. ... "
" ... The Arecibo Observatory comprises a 1,000-foot dish built into the ground that reflects radio waves to a 900-ton instrument suspended above it by cables. The telescope has helped “transform our understanding of the ionosphere, showing us how density, composition and other factors interact to shape this critical region where Earth’s atmosphere meets space,” said Michael Wiltberger, head of NSF's Geospace Section, in a statement. It’s also been used by the Search for Extraterrestrial Intelligence (SETI), an organization of scientists looking for signs of intelligent extraterrestrial life. ... "
" ... The ionosphere is where the dancing lights of the aurora borealis and aurora australis happen. All that electromagnetic activity and solar radiation also have strange effects on radio waves, which are the basis of radar. In general, the ionosphere tends to scatter radio waves; sometimes, if the transmitter is at just the right angle, that means a signal from one place can bounce off the ionosphere and reach a radio receiver on another continent. ... "