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- W2332856925 abstract "Electrons streaming along the magnetic field direction are frequently observed in the plasma sheet of Earth's geomagnetic tail. The impact of these field-aligned electrons on the dynamics of the geomagnetic tail is however not well understood. Here we report the first detection of field-aligned electrons with fluxes increasing at $ensuremath{sim}1text{ }text{ }mathrm{keV}$ forming a ``cool'' beam just prior to the dissipation of energy in the current sheet. These field-aligned beams at $ensuremath{sim}15$ ${R}_{E}$ in the plasma sheet are nearly identical to those commonly observed at auroral altitudes, suggesting the beams are auroral electrons accelerated upward by electric fields parallel (${E}_{ensuremath{parallel}}$) to the geomagnetic field. The density of the beams relative to the ambient electron density is $ensuremath{delta}{n}_{b}/{n}_{e}ensuremath{sim}5--13%$ and the current carried by the beams is $ensuremath{sim}{10}^{ensuremath{-}8}--{10}^{ensuremath{-}7}text{ }text{ }mathrm{A}text{ }{mathrm{m}}^{ensuremath{-}2}$. These beams in high $ensuremath{beta}$ plasmas with large density and temperature gradients appear to satisfy the Bohm criteria to initiate current driven instabilities." @default.
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- W2332856925 date "2012-11-13" @default.
- W2332856925 modified "2023-10-16" @default.
- W2332856925 title "Observations of Ionospheric Electron Beams in the Plasma Sheet" @default.
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- W2332856925 doi "https://doi.org/10.1103/physrevlett.109.205001" @default.
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