Modeling Inner Proton Belt Variability at Energies 1 to 10 MeV Using BAS-PRO
<jats:title>Abstract</jats:title><jats:p>Geomagnetically trapped protons forming Earth's proton radiation belt pose a hazard to orbiting spacecraft. In particular, solar cell degradation is caused by non‐ionising collisions with protons at energies of several megaelectron volt...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/331883 2024-02-04T09:53:37+01:00 Modeling Inner Proton Belt Variability at Energies 1 to 10 MeV Using BAS-PRO Lozinski, AR Horne, RB Glauert, SA Del Zanna, G Claudepierre, SG 2022-01-04T13:29:42Z text/xml application/pdf https://www.repository.cam.ac.uk/handle/1810/331883 https://doi.org/10.17863/CAM.79333 en eng eng American Geophysical Union (AGU) http://dx.doi.org/10.1029/2021ja029777 Journal of Geophysical Research: Space Physics https://www.repository.cam.ac.uk/handle/1810/331883 doi:10.17863/CAM.79333 proton belt radial diffusion trapped protons modeling solar cell degradation Article 2022 ftunivcam https://doi.org/10.17863/CAM.79333 2024-01-11T23:25:07Z <jats:title>Abstract</jats:title><jats:p>Geomagnetically trapped protons forming Earth's proton radiation belt pose a hazard to orbiting spacecraft. In particular, solar cell degradation is caused by non‐ionising collisions with protons at energies of several megaelectron volts (MeV), which can shorten mission lifespan. Dynamic enhancements in trapped proton flux following solar energetic particle events have been observed to last several months, and there is a strong need for physics‐based modeling to predict the impact on spacecraft. However, modeling proton belt variability at this energy is challenging because radial diffusion coefficients are not well constrained. We address this by using the British Antarctic Survey proton belt model BAS‐PRO to perform 3D simulations of the proton belt in the region 1.15 ≤ <jats:italic>L</jats:italic> ≤ 2 from 2014 to 2018. The model is driven by measurements from the Radiation Belt Storm Probes Ion Composition Experiment and Magnetic Electron Ion Spectrometer instruments carried by the Van Allen Probe satellites. To investigate sensitivity, simulations are repeated for three different sets of proton radial diffusion coefficients <jats:italic>D</jats:italic><jats:sub><jats:italic>LL</jats:italic></jats:sub> taken from previous literature. Comparing the time evolution of each result, we find that solar cycle variability can drive up to a ∼75% increase in 7.5 MeV flux at <jats:italic>L</jats:italic> = 1.3 over four years due to the increased importance of collisional loss at low energies. We also show how the anisotropy of proton pitch angle distributions varies with <jats:italic>L</jats:italic> and energy, depending on <jats:italic>D</jats:italic><jats:sub><jats:italic>LL</jats:italic></jats:sub>. However we find that phase space density can vary by three orders of magnitude at <jats:italic>L</jats:italic> = 1.4 and ... Article in Journal/Newspaper Antarc* Antarctic British Antarctic Survey Apollo - University of Cambridge Repository Antarctic |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
proton belt radial diffusion trapped protons modeling solar cell degradation |
spellingShingle |
proton belt radial diffusion trapped protons modeling solar cell degradation Lozinski, AR Horne, RB Glauert, SA Del Zanna, G Claudepierre, SG Modeling Inner Proton Belt Variability at Energies 1 to 10 MeV Using BAS-PRO |
topic_facet |
proton belt radial diffusion trapped protons modeling solar cell degradation |
description |
<jats:title>Abstract</jats:title><jats:p>Geomagnetically trapped protons forming Earth's proton radiation belt pose a hazard to orbiting spacecraft. In particular, solar cell degradation is caused by non‐ionising collisions with protons at energies of several megaelectron volts (MeV), which can shorten mission lifespan. Dynamic enhancements in trapped proton flux following solar energetic particle events have been observed to last several months, and there is a strong need for physics‐based modeling to predict the impact on spacecraft. However, modeling proton belt variability at this energy is challenging because radial diffusion coefficients are not well constrained. We address this by using the British Antarctic Survey proton belt model BAS‐PRO to perform 3D simulations of the proton belt in the region 1.15 ≤ <jats:italic>L</jats:italic> ≤ 2 from 2014 to 2018. The model is driven by measurements from the Radiation Belt Storm Probes Ion Composition Experiment and Magnetic Electron Ion Spectrometer instruments carried by the Van Allen Probe satellites. To investigate sensitivity, simulations are repeated for three different sets of proton radial diffusion coefficients <jats:italic>D</jats:italic><jats:sub><jats:italic>LL</jats:italic></jats:sub> taken from previous literature. Comparing the time evolution of each result, we find that solar cycle variability can drive up to a ∼75% increase in 7.5 MeV flux at <jats:italic>L</jats:italic> = 1.3 over four years due to the increased importance of collisional loss at low energies. We also show how the anisotropy of proton pitch angle distributions varies with <jats:italic>L</jats:italic> and energy, depending on <jats:italic>D</jats:italic><jats:sub><jats:italic>LL</jats:italic></jats:sub>. However we find that phase space density can vary by three orders of magnitude at <jats:italic>L</jats:italic> = 1.4 and ... |
format |
Article in Journal/Newspaper |
author |
Lozinski, AR Horne, RB Glauert, SA Del Zanna, G Claudepierre, SG |
author_facet |
Lozinski, AR Horne, RB Glauert, SA Del Zanna, G Claudepierre, SG |
author_sort |
Lozinski, AR |
title |
Modeling Inner Proton Belt Variability at Energies 1 to 10 MeV Using BAS-PRO |
title_short |
Modeling Inner Proton Belt Variability at Energies 1 to 10 MeV Using BAS-PRO |
title_full |
Modeling Inner Proton Belt Variability at Energies 1 to 10 MeV Using BAS-PRO |
title_fullStr |
Modeling Inner Proton Belt Variability at Energies 1 to 10 MeV Using BAS-PRO |
title_full_unstemmed |
Modeling Inner Proton Belt Variability at Energies 1 to 10 MeV Using BAS-PRO |
title_sort |
modeling inner proton belt variability at energies 1 to 10 mev using bas-pro |
publisher |
American Geophysical Union (AGU) |
publishDate |
2022 |
url |
https://www.repository.cam.ac.uk/handle/1810/331883 https://doi.org/10.17863/CAM.79333 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic British Antarctic Survey |
genre_facet |
Antarc* Antarctic British Antarctic Survey |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/331883 doi:10.17863/CAM.79333 |
op_doi |
https://doi.org/10.17863/CAM.79333 |
_version_ |
1789967063708598272 |