(c) Effects of Ionospheric Limitations Electricity costs as a function of ionospheric power density limits are shown in Fig. 5 for various sidelobe constraints. As stated previously, the 0.01 mW/cm2 sidelobe maxima is recommended for environmental reasons. Given this constraint, there is little or no advantage in high ionospheric limits (above 40 mW/cm2). The reason is that it does not appear possible to develop an amplitude taper which will provide a peak ground power density greater than approximately 40 mW/cm2 while maintaining 0.01 mW/cm2 or less on the first sidelobe. The 23 mW/cm2 ionospheric guideline was a theoretical number developed early in the SPS evaluation program as a threshold limit to prevent nonlinear heating interac-
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