(note: part 5 of our series, from Defense Technical Information Center, DTIC for complete series, click DTIC link)
Experiments to Demonstrate the Practical Uses of Artificial Plasma Clouds in the Lower Ionosphere
Report Date : 21 MAY 1970
Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC
Cesium plasma clouds have been emplaced in the 90 to 103-km altitude region of the ionosphere by rockets and by a 7-in. gun.
These clouds have been studied by coherent-pulse-doppler, high-frequency radar for three purposes: (a) to investigate neutral gas and magnetohydrodynamic motions in the clouds, (b) to investigate the role of such motions in forming the plasma clouds into persistent, artificial, sporadic-E patches, and (c) to investigate the potential of such clouds for illuminating the near-over-the-horizon region and detecting small targets in that region.
(note: "An alkali metal, caesium occurs in lepidolite, pollucite (hydrated silicate of aluminium and caesium) and within other sources", also, "Caesium, being one of the heavier alkali metals, is also one of the most reactive and is highly explosive when it comes in contact with water, as the hydrogen gas produced by the reaction is heated by the thermal energy released at the same time, causing ignition, and a violent explosion (the same as all alkali metals) - but caesium is so reactive, this explosive reaction can even be triggered by cold water or ice.", from wikipedia.com)