Phoenix—1 Observations of Equatorial Zone Particle Precipitation
The precipitation of magnetospheric particles at low altitude (160 – 300 km) near the geomagnetic equator during moderate geomagnetic conditions was studied by the ONR-602 experiment on board the S81-1 pallet mission in 1982. Significant fluxes of low energy (~1 MeV) protons were observed, with maximum intensity along the line of minimum magnetic field strength. These protons exhibit an altitude dependence that varies as the fifth power of the altitude, and a flux that is higher than that measured in previous missions (circa 1970). The source function, atmospheric loss processes and pitch angle distributions of these particles are investigated.
KeywordsPitch Angle Radiation Belt Proton Flux Equatorial Zone Atmospheric Density
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- Lyons, L. R. and D. J. Williams, in Quantitative Aspects of Magnetospheric Physics, (Dordrecht: 1983: D. Reidel Co.) p. 24.Google Scholar
- Moritz, J., Z. Geophys., 38, 701, (1972).Google Scholar
- Roederer, J. G., Dynamics of Geomagnetically Trapped Radiation, (Heidelberg: 1970: Springer-Verlag) p. 37.Google Scholar
- Sawyer, D. M. and J. I. Vette, AP-8 Trapped Proton Environment for Solar Maximum and Solar Minimum, (Greenbelt, MD: 1976: NASA, NSSDC), p. 93.Google Scholar
- Spjeldvik, W. N. and T. A. Fritz, in Energetic Ion Composition in the Earth’s Magnetosphere, ed. R. G. Johnson, (Dordrecht: 1983: D. Reidel Co.), p. 396.Google Scholar
- Stassinopoulos, E. G., World Maps of Constant B, L and Flux Contours, (Greenbelt, MD: 1970: NASA), SP-3054, p. 58.Google Scholar
- U.S. Standard Atmosphere, 1976, (Washington, DC: 1976: Government Printing Office), N0AA-S/T 76–1562.Google Scholar