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TitreHighly elliptical orbits for Arctic observations: assessment of ionizing radiation
AuteurTrichtchenko, L D; Nikitina, L V; Trishchenko, A P; Garand, L
SourceAdvances in Space Research vol. 54, issue 11, 2014 p. 2398-2414, https://doi.org/10.1016/j.asr.2014.09.012
Année2014
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140185
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.asr.2014.09.012
Mediapapier; en ligne; numérique
Formatspdf
Illustrationsgraphs; plots
ProgrammeNord du Canada, risque géoscience, Géoscience pour la sécurité publique
Résumé(disponible en anglais seulement)
The ionizing radiation environment was analyzed for a variety of potential Highly Elliptical Orbits (HEO) with orbital periods ranging from 6 to 24 hours suitable to continuously monitor the Arctic region. Several models available from the ESA's Space Environment Information
System (SPENVIS) online tool were employed, including the new-generation AE9/AP9 model for trapped radiation. Results showed that the total ionizing doze (TID) has a well-pronounced local minimum for 14-hr orbit, which is nearly identical to the overall minimum observed for the
longest period (24hr). The thickness of slab aluminum shielding required to keep the annual TID below 10, 5 and 3.33 krad (i.e. 150, 75 and 50krad for 15 years of mission duration) for a 14-hr orbit is 2.1, 2.7 and 3.1 mm respectively. The 16-hr orbit requires a supplement of 0.5 mm to achieve the same results, while the 24-hr orbit requires less shielding by 0.2 to 0.3 mm.
Comparison between AE8/AP8 and AE9/AP9 models was conducted for all selected orbits. Results demonstrated that the differences were ranging from -70% to +170% depending on orbit geometry.
The vulnerability to the single event effect (SEE) has been compared for all orbits by modelling the Linear Energy Transfer for long-term conditions and for the 5 min ?worst case scenario. The analysis showed no preference among orbits with periods longer than 15-hr, and in
order to keep the 14-hr orbit at the same level, the shielding should be increased by ~ 33% or approximately by 1 mm. To keep the Single Event Upset (SEU) rate produced by the ?worst case event at the same order of magnitude as for the ?statistical long-term case, the thickness of aluminum should be as high as 22 mm. The overall conclusion from space environment point of view is that all HEO orbits with period equal or longer than 14 hours can be regarded as good candidates for operational missions. Therefore, the selection should be based on other criteria,for example, uniformity of spatial coverage for meteorological imaging or the configuration of the ground network for data reception.
Résumé(Résumé en langage clair et simple, non publié)
Évaluation des rayonnements ionisants sur des orbites fortement elliptiques appropriés pour l'observation de l'Arctique La météo spatiale fait référence aux conditions dynamiques du soleil et de l'environnement spatial qui peuvent influer sur les infrastructures essentielles. RNCan exploite le Centre canadien de météo spatiale et étudie les effets de la météo spatiale sur les satellites, les systèmes d'alimentation électrique, les pipelines, les installations de communications radio et le FGISM pour aider l'industrie canadienne à comprendre et à atténuer les effets de la météo spatiale. Dans le présent article l'environnement de rayonnements ionisants a été analysée pour des orbites fortement elliptiques (HEO) avec des périodes orbitale de 6 à 24 heures qui sont appropriées pour la surveillance continue de l'Arctique. Le minimum local de la dose ionisant total des orbites 14-hr et 15-hr a été découvert.
GEOSCAN ID295140