Fig. 4. Computed concentration contours for H2O, H2, and electrons (number per cubic centimeter) 3 h after launch of Skylab. The (x,z) coordinates are in the magnetic meridian plane 1300-km downrange from the launch point, and the cross-sectional view is perpendicular to the launch plane, at an angle of 70° looking back along trajectory. The original exhaust deposition was in the central plane x =0. Also shown are the B-field direction and the observational lines-of-sight from Sagamore Hill to satellites ATS-3 and -5.
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