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    Statistics and Models of the Electron Plasma Density From the Van Allen Probes

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    Ripoll(2024a).pdf (8.074Mb)
    Authors
    Ripoll, J.-F .
    Thaller, S.A.
    Hartley, D. P.
    Malaspina, D.M.
    Kurth, W.S.
    Cunningham, G.S.
    Pierrard, V.
    Wygant, J.
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    Discipline
    Physical sciences
    Subject
    electron cold plasma density
    plasmasphere
    plasma through
    empirical model
    radiation belts
    statistics
    Audience
    Scientific
    Date
    2024
    Metadata
    Show full item record
    Description
    We use the full NASA Van Allen Probes mission (2012–2019) to extract the electron plasma density from the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) and Electric Field and Waves (EFW) instruments and discuss the evolution of the plasmasphere. We generate new statistics including mean and standard deviations of the plasma density with respect to L-shell, magnetic local time (MLT), and various geomagnetic indices. These statistics are generated to be applied in radiation belt physics and space weather codes (with fits provided). The mean plasmasphere is circular around Earth with respect to MLT for Kp < 1. The mean 100 cm−3 level line is above L = 5 and mean 10 cm−3 level expands above the Van Allen Probes apogee for Kp < 1. The outer electron belt lies within the plasmasphere for 60\% of all times. As activity increases (Kp > 2), a gradual MLT asymmetry forms with higher mean density in the afternoon sector due to plumes expanding outward. Conversely, the mean density decreases on the dawn and night sectors. The mean density is between ∼500 and ∼50 cm−3 between L ∼ 4 and L ∼ 6 during quiet and moderately active times (Kp < 3), representing ∼80\% of all times. Statistics in regions of high density below L = 2 are underdefined for intense activity. The highest standard deviation of density represents a factor 2.5 to 3 times the mean above L = 5 and for active times. We find the percent difference between the EFW and EMFISIS densities is bounded by ±20\% for quiet and moderate activity (Kp < 5) and goes up to ±100\% for extreme activity.
    Citation
    Ripoll, J.-F .; Thaller, S.A.; Hartley, D. P.; Malaspina, D.M.; Kurth, W.S.; Cunningham, G.S.; Pierrard, V.; Wygant, J. (2024). Statistics and Models of the Electron Plasma Density From the Van Allen Probes. , Journal of Geophysical Research: Space Physics, Vol. 129, Issue 8, e2024JA032528, DOI: 10.1016/j.atmosenv.2024.120746.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/13421
    doi: http://dx.doi.org/10.1016/j.atmosenv.2024.120746
    url:
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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