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Multisatellite Observations of Ion Holes in the Earth's Plasma Sheet
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- Wang, R. (author)
- Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
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- Vasko, I. Y. (author)
- Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.;Russian Acad Sci, Space Res Inst, Moscow, Russia.
- Artemyev, A. , V (author)
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- Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.;Russian Acad Sci, Space Res Inst, Moscow, Russia. (creator_code:org_t)
- American Geophysical Union (AGU), 2022
- 2022
- English.
- In: Geophysical Research Letters. - : American Geophysical Union (AGU). - 0094-8276 .- 1944-8007. ; 49:8
- Journal article (peer-reviewed)
Abstract
Subject headings
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- We present the first observations of electrostatic solitary waves with electrostatic potential of negative polarity around a fast plasma flow in the Earth's plasma sheet. The solitary waves are observed aboard four Magnetospheric Multiscale spacecraft, which allowed accurately estimating solitary wave properties. Based on a data set of 153 solitary waves, we show that they are locally one-dimensional Debye-scale structures with amplitudes up to 20% of local electron temperature and they propagate at plasma frame speeds ranging from a tenth to a few ion-acoustic speeds at arbitrary angles to the local magnetic field. The solitary waves are associated with multi-component proton distributions and their velocities are around those of a beam-like proton population. We argue that the solitary waves are ion holes, nonlinear structures produced by ion-streaming instabilities, and conclude that once ions are not magnetized, ion holes can propagate oblique to local magnetic field.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- plasma sheet
- solitary waves
- ion holes
- electrostatic instabilities
- ion beam instabilities
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Wang, R.
- Vasko, I. Y.
- Artemyev, A. , V
- Holley, L. C.
- Kamaletdinov, S. ...
- Lotekar, Ajay
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- Mozer, F. S.
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