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dc.contributor.authorLozinski, Alexander
dc.contributor.authorHorne, RB
dc.contributor.authorGlauert, SA
dc.contributor.authorDel Zanna, Giulio
dc.contributor.authorClaudepierre, SG
dc.date.accessioned2022-01-04T13:29:43Z
dc.date.available2022-01-04T13:29:43Z
dc.date.issued2021-12
dc.date.submitted2021-07-09
dc.identifier.issn2169-9380
dc.identifier.otherjgra56894
dc.identifier.other2021ja029777
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/331883
dc.description.abstractAbstract: 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 ≤ L ≤ 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 D LL 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 L = 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 L and energy, depending on D LL . However we find that phase space density can vary by three orders of magnitude at L = 1.4 and μ = 20 MeV/G due to uncertainty in D LL , highlighting the need to better constrain proton D LL at low energy.
dc.languageen
dc.publisherAmerican Geophysical Union (AGU)
dc.subjectMagnetospheric Physics
dc.subjectEXPLORATION GEOPHYSICS
dc.subjectGravity methods
dc.subjectGEODESY AND GRAVITY
dc.subjectTransient deformation
dc.subjectTectonic deformation
dc.subjectTime variable gravity
dc.subjectGravity anomalies and Earth structure
dc.subjectSatellite geodesy: results
dc.subjectSeismic cycle related deformations
dc.subjectHYDROLOGY
dc.subjectEstimation and forecasting
dc.subjectINFORMATICS
dc.subjectForecasting
dc.subjectIONOSPHERE
dc.subjectMAGNETOSPHERIC PHYSICS
dc.subjectNumerical modeling
dc.subjectRadiation belts
dc.subjectMATHEMATICAL GEOPHYSICS
dc.subjectPrediction
dc.subjectProbabilistic forecasting
dc.subjectOCEANOGRAPHY: GENERAL
dc.subjectOcean predictability and prediction
dc.subjectNATURAL HAZARDS
dc.subjectMonitoring, forecasting, prediction
dc.subjectPOLICY SCIENCES
dc.subjectRADIO SCIENCE
dc.subjectInterferometry
dc.subjectIonospheric physics
dc.subjectSEISMOLOGY
dc.subjectContinental crust
dc.subjectEarthquake dynamics
dc.subjectEarthquake source observations
dc.subjectEarthquake interaction, forecasting, and prediction
dc.subjectSeismicity and tectonics
dc.subjectSubduction zones
dc.subjectSPACE WEATHER
dc.subjectModels
dc.subjectSpace radiation environment
dc.subjectPolicy
dc.subjectResearch Article
dc.subjectproton belt
dc.subjectradial diffusion
dc.subjecttrapped protons
dc.subjectmodeling
dc.subjectsolar cell degradation
dc.titleModeling Inner Proton Belt Variability at Energies 1 to 10 MeV Using BAS-PRO
dc.typeArticle
dc.date.updated2022-01-04T13:29:42Z
prism.issueIdentifier12
prism.publicationNameJournal of Geophysical Research: Space Physics
prism.volume126
dc.identifier.doi10.17863/CAM.79333
dcterms.dateAccepted2021-11-17
rioxxterms.versionofrecord10.1029/2021JA029777
rioxxterms.versionAO
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidLozinski, Alexander [0000-0002-6508-487X]
dc.contributor.orcidHorne, RB [0000-0002-0412-6407]
dc.contributor.orcidGlauert, SA [0000-0003-0149-8608]
dc.contributor.orcidDel Zanna, Giulio [0000-0002-4125-0204]
dc.contributor.orcidClaudepierre, SG [0000-0001-5513-5947]
dc.identifier.eissn2169-9402
pubs.funder-project-idScience and Technology Facilities Council (ST/P000665/1)
pubs.funder-project-idSTFC (ST/T000481/1)
pubs.funder-project-idNERC (NE/R009457/1)
cam.issuedOnline2021-12-12


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