I ' LI | + 5h 50m ~ confused record but obliques are clearly present + 6h 31m @ last greatly-disturbed record; oblique 2~hop return evident; (marked stratification continued for another hour). Selected ionograms following Shot 5 show ths following: + 2h 30m to + 3h 20m (Fig. 3.26) = first four pictures contain oblique traces believed dus jto ewmrise effects (0640 hours to 0710 hours)4/; last two are quite normal Figs 3026 - Ionospheric Records at Guam Following Shot 5, Showing Probable Sunrise Effect 4/ This presumption is based upon examination of ionograms for nine non-shot days between 4 May and 13 May; oblique echoes lasting 1/2 hr or more were found at this time of day for three out of nine days. 56 SECRET

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