ms in the device structure result in single event effects in more sensitive devices and technologies. The integral flux of trapped protons as a function of orbit altitude at the Omnidirectional Integral Proton Ruxes at Magnetic Equator magnetic equator is indicated in Figure 3-1. AP-8 for Solar Meximum The slope of this characteristic, particularly E> 5 MmV along the lower margin of the inner belt region indicates that fairly small changes in orbit altitude result in significant changes in the exposure to trapped protons. The other characteristic of geomagnetically trapped protons is the asymmetry which results from the South Atlantic Anomaly (SAA) region. Figures 3-2 and 3-3 indicate contours of proton flux at altitudes of 500 km and 1000 km respectively. In the case of devices and technologies which are Dipole Shell Parameter L susceptible to energetic proton induced Figure 3-1. Variation of Proton Flux Levels single event effects, the rate of occurrence [Barth97] of these effects is highly non-uniform over an orbit traverse through the SAA region. Integral Proton Flux Contours for E > 30 MeV (#/cm2/s) Integral Proton Flux Contours for E > 30 MeV (#/cm2/s) Altitude = 500 km, Solar Maximum Altitude = 1000 km. Solar Maximum Geographic Longitude (deg) Geographic Longitude (deg) Figure 3-3. Proton Flux Contours at 1000 km. Figure 3-2. Proton Flux Contours at 500 km. [Barth97] [Barth97] The integral flux of trapped electrons as a function of orbit altitude at the magnetic equator is indicated in Figure 3-4. As described above for trapped protons, small changes in orbit altitude produce significant changes in the exposure to trapped electrons (on the Omnidirectional Integral Electron Fluxes at Magnetic Equator lower margin of the inner belt region). The AE-8 for Solar Maximum separation of the trapped electron regions into two zones is also depicted in this figure. Figures 3-5 and 3-6 indicate the contours of electron flux at altitudes of 500 km and 1000 km respectively; as shown previously for protons, the presence 