OMEP-EOR: A MeV proton flux specification model for electric orbit raising missions

Electric Orbit Raising (EOR) for telecommunication satellites significantly reduced on-board fuel mass at the price of extended transfer durations. These relatively long transfers, which usually span a few months, cross large spans of the radiation belts, resulting in significant exposure of the spa...

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Autores principales:	Brunet Antoine, Sicard Angélica, Papadimitriou Constantinos, Lazaro Didier, Caron Pablo
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	proton radiation belts electric orbit raising environment specification modelling Meteorology. Climatology QC851-999
Acceso en línea:	https://doaj.org/article/bdd70e1ab34041a4a00b8c8f073c797b
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spelling	oai:doaj.org-article:bdd70e1ab34041a4a00b8c8f073c797b2021-12-02T17:16:27ZOMEP-EOR: A MeV proton flux specification model for electric orbit raising missions2115-725110.1051/swsc/2021038https://doaj.org/article/bdd70e1ab34041a4a00b8c8f073c797b2021-01-01T00:00:00Zhttps://www.swsc-journal.org/articles/swsc/full_html/2021/01/swsc210004/swsc210004.htmlhttps://doaj.org/toc/2115-7251Electric Orbit Raising (EOR) for telecommunication satellites significantly reduced on-board fuel mass at the price of extended transfer durations. These relatively long transfers, which usually span a few months, cross large spans of the radiation belts, resulting in significant exposure of the spacecraft to space radiations. Since they are not very populated, the radiation environment of intermediate regions of the radiation belts is less constrained than on popular orbits such as low Earth orbit or geostationary orbit in standard environment models. In particular, there is a need for more specific models for the MeV energy range proton fluxes, responsible for solar arrays degradations, and hence critical for EOR missions. ONERA has developed a specification model of proton fluxes dedicated for EOR missions as part of the ESA ARTES program. This model can estimate the average proton fluxes between 60 keV and 20 MeV on arbitrary trajectories on the typical duration of EOR transfers. A global statistical model of the radiation belts was extracted from the Van Allen Probes RBSPICE data. For regions with no or low sampling, simulation results from the Salammbô radiation belt model were used. Special care was taken to model the temporal dynamics of the belts on the considered mission durations. A Gaussian Process model was developed, allowing to compute the distribution of the average fluxes on arbitrary mission durations analytically. Satellites trajectories can be flown in the resulting global distribution, yielding the proton flux spectrum distribution as seen by the spacecraft. We show the results of the model on a typical EOR trajectory. The obtained fluxes are compared to the standard AP8 model, the AP9 model and validated using the THEMIS satellites data. We illustrate the expected effect on solar cell degradation, where our model shows an increase of up to 20% degradation prediction compared to AP8.Brunet AntoineSicard AngélicaPapadimitriou ConstantinosLazaro DidierCaron PabloEDP Sciencesarticleprotonradiation beltselectric orbit raisingenvironment specificationmodellingMeteorology. ClimatologyQC851-999ENJournal of Space Weather and Space Climate, Vol 11, p 55 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	proton radiation belts electric orbit raising environment specification modelling Meteorology. Climatology QC851-999
spellingShingle	proton radiation belts electric orbit raising environment specification modelling Meteorology. Climatology QC851-999 Brunet Antoine Sicard Angélica Papadimitriou Constantinos Lazaro Didier Caron Pablo OMEP-EOR: A MeV proton flux specification model for electric orbit raising missions
description	Electric Orbit Raising (EOR) for telecommunication satellites significantly reduced on-board fuel mass at the price of extended transfer durations. These relatively long transfers, which usually span a few months, cross large spans of the radiation belts, resulting in significant exposure of the spacecraft to space radiations. Since they are not very populated, the radiation environment of intermediate regions of the radiation belts is less constrained than on popular orbits such as low Earth orbit or geostationary orbit in standard environment models. In particular, there is a need for more specific models for the MeV energy range proton fluxes, responsible for solar arrays degradations, and hence critical for EOR missions. ONERA has developed a specification model of proton fluxes dedicated for EOR missions as part of the ESA ARTES program. This model can estimate the average proton fluxes between 60 keV and 20 MeV on arbitrary trajectories on the typical duration of EOR transfers. A global statistical model of the radiation belts was extracted from the Van Allen Probes RBSPICE data. For regions with no or low sampling, simulation results from the Salammbô radiation belt model were used. Special care was taken to model the temporal dynamics of the belts on the considered mission durations. A Gaussian Process model was developed, allowing to compute the distribution of the average fluxes on arbitrary mission durations analytically. Satellites trajectories can be flown in the resulting global distribution, yielding the proton flux spectrum distribution as seen by the spacecraft. We show the results of the model on a typical EOR trajectory. The obtained fluxes are compared to the standard AP8 model, the AP9 model and validated using the THEMIS satellites data. We illustrate the expected effect on solar cell degradation, where our model shows an increase of up to 20% degradation prediction compared to AP8.
format	article
author	Brunet Antoine Sicard Angélica Papadimitriou Constantinos Lazaro Didier Caron Pablo
author_facet	Brunet Antoine Sicard Angélica Papadimitriou Constantinos Lazaro Didier Caron Pablo
author_sort	Brunet Antoine
title	OMEP-EOR: A MeV proton flux specification model for electric orbit raising missions
title_short	OMEP-EOR: A MeV proton flux specification model for electric orbit raising missions
title_full	OMEP-EOR: A MeV proton flux specification model for electric orbit raising missions
title_fullStr	OMEP-EOR: A MeV proton flux specification model for electric orbit raising missions
title_full_unstemmed	OMEP-EOR: A MeV proton flux specification model for electric orbit raising missions
title_sort	omep-eor: a mev proton flux specification model for electric orbit raising missions
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/bdd70e1ab34041a4a00b8c8f073c797b
work_keys_str_mv	AT brunetantoine omepeoramevprotonfluxspecificationmodelforelectricorbitraisingmissions AT sicardangelica omepeoramevprotonfluxspecificationmodelforelectricorbitraisingmissions AT papadimitriouconstantinos omepeoramevprotonfluxspecificationmodelforelectricorbitraisingmissions AT lazarodidier omepeoramevprotonfluxspecificationmodelforelectricorbitraisingmissions AT caronpablo omepeoramevprotonfluxspecificationmodelforelectricorbitraisingmissions
_version_	1718381166529085440

OMEP-EOR: A MeV proton flux specification model for electric orbit raising missions

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