Calculating low-altitude trapped particle fluxes with the NASA models AP-8 and AE-8
Magnetic field effects
Trapped particle fluxes
Trapped radiation models
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Accessing the NASA trapped radiation models AP-8 and AE-8 with (B,L) values obtained with modern geomagnetic field models causes an unrealistic secular increase of the predicted flux over low altitude orbits. We show the secular variation of the orbit-averaged particle flux along the LDEF orbit and the mission dose, obtained using the AP-8 trapped radiation models with an epoch-dependent magnetic field. The artificially increased epoch-dependent fluxes and doses are compared to the flux and dose obtained with a consistent and more correct procedure for predicting fluxes with the NASA models. This procedure has been implemented in the radiation analysis software package UNIRAD developed and distributed by BIRA-IASB.
CitationHeynderickx, D.; Lemaire, J.; Daly, E.J.; Evans, H.D.R. (1996). Calculating low-altitude trapped particle fluxes with the NASA models AP-8 and AE-8. , Radiation Measurements, Vol. 26, Issue 6, 947-952, DOI: 10.1016/S1350-4487(96)00096-0.