title: Calculating low-altitude trapped particle fluxes with the NASA models AP-8 and AE-8.
abstract: 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.
authors.affiliation: BIRA/IASB, Brussels, Belgium.
authors.forename: D
authors.initials: D
authors.lastname: Heynderickx
authors.forename: J
authors.initials: J
authors.lastname: Lemaire
authors.forename: E J
authors.initials: EJ
authors.lastname: Daly
authors.forename: H D
authors.initials: HD
authors.lastname: Evans
mesh_terms: D001267:Atlantic Ocean; D018534:Earth, Planet; D004583:Electrons; D008280:Magnetics; D008962:Models, Theoretical; D011522:Protons; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000706:statistics & numerical data; D012984:Software; D019445:Solar Activity; D013020:South America; D013026:Space Flight; D018531:Spacecraft
chemical_list: D011522:Protons