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    Radial Evolution of Non-Maxwellian Electron Populations Derived from Quasi-thermal Noise Spectroscopy: Parker Solar Probe Observations

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    Authors
    Zheng, X.
    Liu, K.
    Martinović, M.M.
    Pierrard, V.
    Klein, K.G.
    Liu, M.
    Abraham, J.B.
    Liu, Y.
    Luo, J.
    Lin, X.
    Liu, G.
    Li, J.
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    Discipline
    Physical sciences
    Audience
    Scientific
    Date
    2024
    Metadata
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    Description
    Understanding the transport of energy within space plasmas, particularly in the solar wind, remains a complex challenge. Accurate measurement of electron temperatures and their nonthermal characteristics is crucial for comprehending energy transport properties in plasmas. Quasi-thermal-noise (QTN) spectroscopy has emerged as a dependable tool for precise electron parameters assessment as it is less susceptible to spacecraft effects than particle detectors. In this study, we apply a QTN spectroscopy fitting method to analyze data from the Parker Solar Probe FIELDS radio instrument obtained during Encounters 2 through 13, under unbiased antenna conditions. We use the kappa function to characterize the electron velocity distribution and employ a fitting technique to derive the changes in each parameter across heliocentric distances ranging from 12 Rs to 76 Rs. Specifically, we find that the electron density scales as ne ∝ r−2.09±0.04 and the Te ∝ r−0.65±0.02. The distribution of the kappa index has three distinct regions as a function of radial distance from the Sun. Furthermore, we conduct a statistical analysis of solar wind energy flux which we finds follows a power-law relationship wtotal ∝ r−1.92±0.04.
    Citation
    Zheng, X.; Liu, K.; Martinović, M.M.; Pierrard, V.; Klein, K.G.; Liu, M.; Abraham, J.B.; Liu, Y.; Luo, J.; Lin, X.; Liu, G.; Li, J. (2024). Radial Evolution of Non-Maxwellian Electron Populations Derived from Quasi-thermal Noise Spectroscopy: Parker Solar Probe Observations. , The Astrophysical Journal, Vol. 977, Issue 1, A39, DOI: 10.3847/1538-4357/ad7d05.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/13530
    doi: http://dx.doi.org/10.3847/1538-4357/ad7d05
    url:
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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