APPENDIX C - Continued PF Perturbation Factor, see Equation (1), Section 1.2 PLV Personnel Launch Vehicle, see Appendix B POTV Personnel Orbital Transfer Vehicle, see Appendix B REP Relativistic Electron Precipitation (from Radiation Belts) RSR Reference System Report, reference, RSR, 1978 SCATHA Satellite, see Section 4.6.2 SPE Solar Proton Event SPS Satellite Power System Spread F Ionospheric Irregularity in F-region, due to plasma turbulence, etc. So called because of its signal on an ionosonde. A region of enhanced or depleted F-region ionization tends to give rise to this effect. TID Traveling Ionospheric Disturbance Thermosphere Pegion of the upper atmosphere from the mesopause (85 km) on outward, perhaps to 500-1000 km. So called because the temperature increases mainly because solar radiation (UV and X-rays) is absorbed by the atmosphere. Includes much of the ionosphere. The terms mesosphere and thermosphere are used to emphasize the temperature structure and the neutral composition, and the term ionosphere stresses the changing electron density with its impact on charged particles and on electromagnetic wave propagation WATERHOLE See Section 2.5.3, analogous to LAGOPEDO ]-D, 2-D, 3-D Used in the context of computer modeling of the structure and dynamics of the atmosphere. "1-D", a one-dimensional model considers only the variation of parameters (density, temperature, composition, etc.) with height, while a "2-D” model also shows variation with latitude but still involves averaging over longtitude ("zonal average"). A "3-D" (three-dimensional) model presents a proper representation for all geometric/geographic factors. Conceptually, both 1-D and 2-D models should involve an averaging over day-night conditions, although often 1-D and 2-D day-time and nighttime calculations are made to illustrate diurnally varying effects.
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