Figure 1.6 SPE and SAA zones as a function of the longitude of the ascending node of the ISS and Mir orbits. Shading in the top panel shows the locations of the SPE and SAA zones. Circles show the fraction of the orbit inside SPE zones for four assumed radii of the zone (30 to 45 degrees in 5-degree steps) based on simplified geometry. The bottom panel shows radiation data from the Mir space station during a non-SPE orbit (line 3) and two orbits during the SPE of September 29, 1989.21



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