Radiation Belt Daily Average Electron Flux Model (RB‐Daily‐E) From the Seven‐Year Van Allen Probes Mission and Its Application to Interpret GPS On‐Orbit Solar Array Degradation
Abstract We use NASA's Van Allen Probes data to build a 3‐dimensional Radiation Belt Daily Average Electron flux model (RB‐Daily‐E) covering 25 differential energies (33–7,700 keV), 17 pitch angles, and a variable number of L shells from 2 to 7. RB‐Daily‐E can be used to deduce the fluences obs...
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Wiley
2022-11-01
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| Series: | Space Weather |
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| Online Access: | https://doi.org/10.1029/2022SW003183 |
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| author | Christine Gabrielse Justin H. Lee Seth Claudepierre Don Walker Paul O’Brien James Roeder Yao Lao Jann Grovogui Drew L. Turner Andrei Runov Alexander Boyd Joseph Fennell J. Bernard Blake Kevin Lopez Yoshizumi Miyoshi Kunihiro Keika Nana Higashio Iku Shinohara Shun Imajo Satoshi Kurita Takefumi Mitani |
| author_facet | Christine Gabrielse Justin H. Lee Seth Claudepierre Don Walker Paul O’Brien James Roeder Yao Lao Jann Grovogui Drew L. Turner Andrei Runov Alexander Boyd Joseph Fennell J. Bernard Blake Kevin Lopez Yoshizumi Miyoshi Kunihiro Keika Nana Higashio Iku Shinohara Shun Imajo Satoshi Kurita Takefumi Mitani |
| author_sort | Christine Gabrielse |
| collection | DOAJ |
| description | Abstract We use NASA's Van Allen Probes data to build a 3‐dimensional Radiation Belt Daily Average Electron flux model (RB‐Daily‐E) covering 25 differential energies (33–7,700 keV), 17 pitch angles, and a variable number of L shells from 2 to 7. RB‐Daily‐E can be used to deduce the fluences observed by any satellite that flew within Van Allen Probes' 7‐year mission lifetime. We supplement Van Allen Probes fluxes with THEMIS average fluxes to cover higher L shells when applying the model to a secondary satellite. RB‐Daily‐E agrees with both the Arase high‐energy electron experiment (XEP) flux data and the GPS Combined X‐ray Dosimeter (CXD) electron flux approximately within a factor of two or better, and comparisons with AE9 are as expected. The RB‐Daily‐E Model has applications for when actual fluxes on day‐timescales are required for post‐anomaly investigations, including long‐term radiation environment effects such as solar cell and solar array degradation. We therefore applied the model to two GPS satellites to determine electron fluence inputs to the Equivalent Flux (EQFLUX) solar cell degradation model. The modeled voltage degradation well‐matched the voltage degradation trends identified in the GPS telemetry data, suggesting that the radiation environment is the primary cause of the voltage degradation. The current degradation was largely underestimated, suggesting that current degradation is influenced by other sources. |
| format | Article |
| id | doaj-art-5a9b6c2ab38b4e6c8c49cc5eb7eaebd8 |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2022-11-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-5a9b6c2ab38b4e6c8c49cc5eb7eaebd82025-01-14T16:35:33ZengWileySpace Weather1542-73902022-11-012011n/an/a10.1029/2022SW003183Radiation Belt Daily Average Electron Flux Model (RB‐Daily‐E) From the Seven‐Year Van Allen Probes Mission and Its Application to Interpret GPS On‐Orbit Solar Array DegradationChristine Gabrielse0Justin H. Lee1Seth Claudepierre2Don Walker3Paul O’Brien4James Roeder5Yao Lao6Jann Grovogui7Drew L. Turner8Andrei Runov9Alexander Boyd10Joseph Fennell11J. Bernard Blake12Kevin Lopez13Yoshizumi Miyoshi14Kunihiro Keika15Nana Higashio16Iku Shinohara17Shun Imajo18Satoshi Kurita19Takefumi Mitani20The Aerospace Corporation El Segundo CA USAThe Aerospace Corporation El Segundo CA USADepartment of Atmospheric and Oceanic Sciences University of California Los Angeles CA USAThe Aerospace Corporation El Segundo CA USAThe Aerospace Corporation El Segundo CA USAThe Aerospace Corporation El Segundo CA USAThe Aerospace Corporation El Segundo CA USAThe Aerospace Corporation El Segundo CA USAThe Johns Hopkins University Applied Physics Laboratory Laurel MD USAEarth, Planetary, and Space Sciences Department University of California Los Angeles CA USAThe Aerospace Corporation El Segundo CA USAThe Aerospace Corporation El Segundo CA USAThe Aerospace Corporation El Segundo CA USAThe Aerospace Corporation El Segundo CA USAInstitute for Space‐Earth Environmental Research Nagoya University Nagoya JapanGraduate School of Science The University of Tokyo Tokyo JapanResearch & Development Directorate Japan Aerospace Exploration Agency Tokyo JapanInstitute of Space and Astronautical Science Japan Aerospace Exploration Agency Tokyo JapanData Analysis Center for Geomagnetism and Space Magnetism Graduate School of Science Kyoto University Kyoto JapanResearch Institute for Sustainable Humanosphere Kyoto University Uji JapanInstitute of Space and Astronautical Science Japan Aerospace Exploration Agency Tokyo JapanAbstract We use NASA's Van Allen Probes data to build a 3‐dimensional Radiation Belt Daily Average Electron flux model (RB‐Daily‐E) covering 25 differential energies (33–7,700 keV), 17 pitch angles, and a variable number of L shells from 2 to 7. RB‐Daily‐E can be used to deduce the fluences observed by any satellite that flew within Van Allen Probes' 7‐year mission lifetime. We supplement Van Allen Probes fluxes with THEMIS average fluxes to cover higher L shells when applying the model to a secondary satellite. RB‐Daily‐E agrees with both the Arase high‐energy electron experiment (XEP) flux data and the GPS Combined X‐ray Dosimeter (CXD) electron flux approximately within a factor of two or better, and comparisons with AE9 are as expected. The RB‐Daily‐E Model has applications for when actual fluxes on day‐timescales are required for post‐anomaly investigations, including long‐term radiation environment effects such as solar cell and solar array degradation. We therefore applied the model to two GPS satellites to determine electron fluence inputs to the Equivalent Flux (EQFLUX) solar cell degradation model. The modeled voltage degradation well‐matched the voltage degradation trends identified in the GPS telemetry data, suggesting that the radiation environment is the primary cause of the voltage degradation. The current degradation was largely underestimated, suggesting that current degradation is influenced by other sources.https://doi.org/10.1029/2022SW003183radiation belt modelingsolar cell degradationVan Allen probeselectron fluxeshindcastforensics |
| spellingShingle | Christine Gabrielse Justin H. Lee Seth Claudepierre Don Walker Paul O’Brien James Roeder Yao Lao Jann Grovogui Drew L. Turner Andrei Runov Alexander Boyd Joseph Fennell J. Bernard Blake Kevin Lopez Yoshizumi Miyoshi Kunihiro Keika Nana Higashio Iku Shinohara Shun Imajo Satoshi Kurita Takefumi Mitani Radiation Belt Daily Average Electron Flux Model (RB‐Daily‐E) From the Seven‐Year Van Allen Probes Mission and Its Application to Interpret GPS On‐Orbit Solar Array Degradation Space Weather radiation belt modeling solar cell degradation Van Allen probes electron fluxes hindcast forensics |
| title | Radiation Belt Daily Average Electron Flux Model (RB‐Daily‐E) From the Seven‐Year Van Allen Probes Mission and Its Application to Interpret GPS On‐Orbit Solar Array Degradation |
| title_full | Radiation Belt Daily Average Electron Flux Model (RB‐Daily‐E) From the Seven‐Year Van Allen Probes Mission and Its Application to Interpret GPS On‐Orbit Solar Array Degradation |
| title_fullStr | Radiation Belt Daily Average Electron Flux Model (RB‐Daily‐E) From the Seven‐Year Van Allen Probes Mission and Its Application to Interpret GPS On‐Orbit Solar Array Degradation |
| title_full_unstemmed | Radiation Belt Daily Average Electron Flux Model (RB‐Daily‐E) From the Seven‐Year Van Allen Probes Mission and Its Application to Interpret GPS On‐Orbit Solar Array Degradation |
| title_short | Radiation Belt Daily Average Electron Flux Model (RB‐Daily‐E) From the Seven‐Year Van Allen Probes Mission and Its Application to Interpret GPS On‐Orbit Solar Array Degradation |
| title_sort | radiation belt daily average electron flux model rb daily e from the seven year van allen probes mission and its application to interpret gps on orbit solar array degradation |
| topic | radiation belt modeling solar cell degradation Van Allen probes electron fluxes hindcast forensics |
| url | https://doi.org/10.1029/2022SW003183 |
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