An extension of an analysis originally presented in a classified Rand Report dealing with the decay of ionization impulses in the D & E regions. The Report indicates that, considering the ambient ionization in these regions, the lifetime of added ionization such as would result from nuclear bursts in space is greatest near 75 km during the day and 95 km at night. The limited calculations presented in the Report are extended in this Memorandum to a wider range of altitudes, and results are given for times up to several thousand seconds following the ionization impulses
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