Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aiaa.meetq....r&link_type=abstract
American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting, 18th, Pasadena, Calif., Jan. 14-16, 1980, 8 p.
Astronomy and Astrophysics
Astronomy
Electron Radiation, Electron Spectroscopy, High Energy Electrons, Outer Radiation Belt, Radiation Dosage, Spacecraft Charging, Bremsstrahlung, Elliptical Orbits, Magnetic Equator, Radial Distribution, Radiation Shielding, Spectroscopic Analysis, Transfer Orbits
Scientific paper
Detailed spectral measurements of energetic electrons between 47-5100 keV have been made with the SC-3 experiment aboard the P78-2 (SCATHA) spacecraft. During the period 29 January-2 February 1979 the spacecraft was in a highly elliptical orbit. Measurements of the outer radiation belt electrons over a range of the closed interval between 3.5 and 8.0 were made near the geomagnetic equator in each case. Spin-averaged electron spectra in 12 to 24 energy channels have been obtained in fine L intervals. The magnetic activity at the time of the measurements was low, but a modest magnetic storm D(st) = -79 had occurred approximately 10 days earlier. Comparisons of the measured radial profiles and electron spectra with the NASA AE-4 and AEI-7 HI/LO radiation models have been made. Under these conditions the measured data are in better agreement with the AE-4 model than with the AEI-7 HI model, although the present data are more intense above 4 MeV than the AE-4 model. The relative impact of the measured spectrum on the dose profile encountered by a synchronous orbit satellite, as compared to the AE-4 and the AEI-7 spectra, has been examined. For thin aluminum shields (less than or equal to 0.45 cm) the dose received is comparable using either the models or measured spectra. For thicker shields the bremsstrahlung dose dominates over the direct electron effects
Gaines Edward E.
Imhof William L.
Nightingale Richard W.
Reagan J. B.
Stassinopoulos E. G.
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