Fig. 3.5. Total electron content data obtained from the Sagamore Hill Radio Observatory in Hamilton, Mass., looking towards the geostationary satellite ATS-3 on 14 May 1973. (Picture and caption from Ref. 3.4.) faster than the natural 0+ loss reaction mechanisms and therefore result in a considerable reduction in the 0+ concentration. Following the above reactions are a set of rapid charge recombination reactions that result in the removal of electrons: More recently, two deliberate attempts have been made to produce similar ’’holes” in the ionosphere. Codenamed LAGOPEDO (See Ref. 3.5), these experiments utilized rockets to carry explosive payloads into the ionosphere. The detonation products of the explosives were H20, CO2 and N2. Both experiments successfully produced "holes” in the ionosphere that were accompanied by enhanced airglow as predicted by the calculation of Sutherland and Zinn (Ref. 3.6), and others. While the analysis of the data from LAGOPEDO is still in progress, some preliminary results were presented in 13 papers at a special session of the Spring Meeting of the American Geophysical Union in Miami in April (proceedings not yet available). Some of the
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