Radio Reflection by Free Radicals in Earth's Atmosphere

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Science  30 Jun 1967:
Vol. 156, Issue 3783, pp. 1730-1732
DOI: 10.1126/science.156.3783.1730


Reflections of megacycle-per-second radio signals by free radicals in Earth's ionosphere are observed having about the intensity predicted for induced magnetic-dipole transitions. It seems that magnetic atoms, ions, and molecules in planetary atmospheres may be detected by this method. These cbservations were made with the topside ionosonder of the Canadian satellite Alouette II.