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Comparison between Measured and Simulated HEO Radiation Belt Dose Observations: Solar Cycle Dependence
Crosby N.B., Foullon C., Heynderickx D., Fennell J.F.,
Traditional simulation of the radiation belts relies on empirical modelling. The NASA AP-8 and AE-8 models for protons and electrons, respectively, still are the de facto standard for engineering applications. Apart from separate versions for solar minimum and solar maximum, they do not include variations shorter than the traditional eleven year solar cycle, that is important for the dynamic behaviour of the outer electron radiation belt. The highly elliptical orbit (HEO) of the HEO 1997-068 (HEO-3) spacecraft offers continuous monitoring of the radiation belts, traversing them several times per day. The HEO spacecraft contains four dosimeters. Here we present a comparison study between the measured dose rates and dose rates obtained with AP-8 and AE-8 spectra and the SHIELDOSE shielding code. The ratio between the two values is studied as a function of time in (B,L) space. The ratio is also studied as a function of solar activity, especially at times when high speed solar winds occur and when solar proton events occur. Results regarding the October and November 2003 solar events will be presented.