4.1- 1 Activity Matrix Cost Characteristics .................... 140 4.1- 2 Candidate Earth Launch Vehicle Concepts ................. 140 4.1-3 Cost per Flight Comparisons.................................142 4.1- 4 Air-Augmented HTO-SSTO Concept .......................... 143 4.2- 1 Common Stage LO2/LH2 Concept .......................... 146 4.2- 2 OTV Flight Profile .........................................147 4.2- 3 OTV Performance Capabilities .......................... 148 4.3- 1 Passenger Module Mass Trend (No. of Passengers Versus Mass/Man) ........................ 150 4.3- 2 Crew and Resupply Module...............................150 4.4- 1 Payload Integration .................................... 151 4.4- 2 SPS Cargo Traffic Model - Cumulative Cargo Masses to Orbit . 152 4.4- 3 SPS Cargo Traffic Model Supply and Demand Rates . . . 152 5.1- 1 SPS Program Breakdown Structure ........................ 155 5.1- 2 SPS Program Development...............................156 5.2- 1 Program Cost Relationships . 161 5.2- 2 System Cost by Fiscal Year...............................165 5.2- 3 Economic Comparison - Example SPS Cash Flow Based on Estimated Investment Costs and Funds Generated by 4 Satellite Installations ........................ 173 6.1-1 Van Allen Belt Particle Dose...................195 6.1-2 Solar Flare Particle Dose.......................195 6.1-3 Galactic (Cosmic) Particle Radiation Dose ..... 196 6.1-4 Total Nuclear Radiation Dose ........................... 196 6.1-5 Low-Altitude Van Allen Orbit Doses ........................ 197 6.2-1 Local Time Dependence of Phenomena ....... 201 6.2-2 Secondary Electron Effects ................................. 203 6.3-1 Structure of Earth's Ionosphere ........................ 208 6.3-2 RF Frequency Interference . 209
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