Abstract. A statistical model for cumulatiw solar proton event fluences during space missions is presented that covers both the solar minimum and solar rnaximum phases of the solar cycle. It is based on data &om the IMP and GOES series of satellites that is integrated together to allow the best features of each data set to be taken advantage of. 'This allows fluence-energy spectra to be extended out to energies of 327 MeV.
A modeling approach is described for predicting charge collection in space-based infrared detector arrays due to ionizing particle radiation. The modeling uses a combination of analytical and Monte Carlo techniques to capture the essential features of energetic-ion-induced charge collection to detector pixels in a two-dimensional array. The model addresses several aspects that are necessary for high fidelity simulation of complex focal plane array structures including multiple layers, sub-regions within layers, variation of LET with range, secondary electron scattering, free-field diffusion, and field-assisted diffusion. Example results are given and predictions are compared to experimental data.*
Dark frames from orbiting infrared detector arrays are analyzed using a charge-collection model to investigate the effects of secondary and primary particle environments in infrared detectors and related electronics. The effects of different components of the primary and secondary environments are assessed by examining trends with time and pixel-to-pixel charge correlations. I. INTRODUCTION U SE OF sensitive infrared detectors in space poses significant challenges for the astronomy, military, and radiation-effects communities. These devices are designed to respond to the low levels of ionization deposited by infrared photons. This high detector sensitivity, coupled with the faintness of infrared sources typically observed by these detectors, necessitates that detectors operate at cryogenic temperatures, where charge mobilities are low and charges can become metastably trapped. As such, infrared detectors are susceptible to a rich variety of radiation effects that can be caused not just by proton-induced nuclear recoils and heavy ions but also by single low-LET (so-called minimum-ionizing) particles in the radiation environment [1]-[3]. Moreover, the faintness of most infrared sources of interest means that observations are often of long duration so there is ample opportunity for radiation effects to corrupt detector readings. Previous studies have reported significantly higher-than-expected rates of radiation-induced contamination in images Manuscript
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