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    Origin of the differential fluxes of low-energy electrons in the inner heliosheath

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    Origin_of_the_differential.pdf (550.3Kb)
    Date
    2017
    Author
    Fahr, H.J.
    Ferreira, S.E.S.
    Potgieter, M.S.
    Krimigis, S.M.
    Fichtner, H.
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    Abstract
    The study addresses the question of the origin of low-energy electrons measured by Voyager 1 in the multi-keV range in the inner heliosheath. It intends to demonstrate that the observed keV-fluxes of electrons are consistent with their transmission through the termination shock under the influence of the associated electrostatic field. A power-law representation of the electron velocity distribution just downstream of the solar wind termination shock is motivated and formulated in terms of a so-called κ-distribution function. From this initial function spectral electron fluxes in the range 40–70 keV are derived and compared to the data. It is shown that with κ-values between 7 and 8 the data can be satisfactorily explained. Given these comparatively high κ-values, it is concluded that the electron distribution just downstream of the termination shock relaxes toward but does not reach a Maxwellian shape in the inner heliosheath
    URI
    http://hdl.handle.net/10394/25967
    https://doi.org/10.3847/2041-8213/aa8def
    http://iopscience.iop.org/article/10.3847/2041-8213/aa8def
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