to KM (3.425 37M 27.+2h 35M 1 14.43n 17M 28.+3h12M dmwee soc 1349458 660 KM 800 q¢ Beret +—~+- 600: 400 200 a 2 3 4 . 6 8 10 14 uc 2 3 4 6 8 10 14 uc Fig. 3.10 = Ionospheric Records at Rongerik Following Shot 1 (left) and Shot 2 (right), Showing Earliest F2 Returns at about 2 1/2 br after Each Shot and also F2 Returns from Several Levels about 3 1/4 hr after Each Shot