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Equatorial Pitch Angle Distributions of 1-50 keV Electrons in Earth's Inner Magnetosphere: An Empirical Model Based on the Van Allen Probes Observations


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dc.contributorH. Zhao, zzh0054@auburn.eduen_US
dc.creatorZhao, H
dc.creatorFriedel, R
dc.creatorChen, Y
dc.creatorBaker, D
dc.creatorLi, X
dc.creatorMalaspina, D
dc.creatorLarsen, B
dc.creatorSkoug, R
dc.creatorFunsten, H
dc.creatorReeves, G
dc.creatorBoyd, A
dc.date.accessioned2023-01-19T19:38:49Z
dc.date.available2023-01-19T19:38:49Z
dc.date.created2021
dc.identifier10.1029/2020JA028322en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020JA028322en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50483
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-551
dc.description.abstractUsing 7 years of data from the Helium, Oxygen, Proton, and Electron instrument on the Van Allen Probes, equatorial pitch angle distributions (PADs) of 1-50 keV electrons in Earth's inner magnetosphere are investigated statistically. An empirical model of electron equatorial PADs as a function of radial distance, magnetic local time, geomagnetic activity, and electron energy is constructed using the method of Legendre polynomial fitting. Model results show that most equatorial PADs of 1-10s of keV electrons in Earth's inner magnetosphere are pancake PADs, and the lack of butterfly PADs is likely due to their relatively flat or positive flux radial gradients at higher altitudes. During geomagnetically quiet times, more anisotropic distributions of 1-10s of keV electrons at dayside than nightside are observed, which could be responsible for moderate chorus wave activities at dayside during quiet times as reported by previous studies. During active times, the anisotropy of 1-10s of keV electrons significantly enhances, consistent with the enhanced chorus wave activity during active times and suggesting the critical role of 1-10s of keV electrons in generating chorus waves in Earth's inner magnetosphere. Different enhanced anisotropy patterns of different energy electrons are also observed during active times: at R > similar to 4 R-E, keV electrons are more anisotropic at dawn to noon, while 10s of keV electrons have larger anisotropy at midnight to dawn. These differences, combined with the statistical distribution of chorus waves shown in previous studies, suggest the differential roles of electrons with different energies in generating chorus waves with different properties.en_US
dc.formatPDFen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.ispartofJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICSen_US
dc.relation.ispartofseries2169-9380en_US
dc.rights©American Geophysical Union 2021. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Zhao, Hong, et al. "Equatorial pitch angle distributions of 1–50 kev electrons in earth's inner magnetosphere: An empirical model based on the Van Allen probes observations." Journal of Geophysical Research: Space Physics 126.1 (2021): e2020JA028322.en_US
dc.titleEquatorial Pitch Angle Distributions of 1-50 keV Electrons in Earth's Inner Magnetosphere: An Empirical Model Based on the Van Allen Probes Observationsen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume126en_US
dc.citation.issue1en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0003-1191-1558en_US
dc.creator.orcid0000-0002-5228-0281en_US
dc.creator.orcid0000-0001-8292-7691en_US
dc.creator.orcid0000-0002-1683-3192en_US
dc.creator.orcid0000-0003-4515-0208en_US

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