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    Linear Stability in the Inner Heliosphere: Helios Re-evaluated

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    Klein_2019_ApJ_887_234.pdf
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    Author
    Klein, Kristopher G. cc
    Martinović, Mihailo
    Stansby, David
    Horbury, Timothy S.
    Affiliation
    Univ Arizona
    Issue Date
    2019-12-23
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Kristopher G. Klein et al 2019 ApJ 887 234
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    Copyright © 2019. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Wave-particle instabilities driven by departures from local thermodynamic equilibrium have been conjectured to play a role in governing solar wind dynamics. We calculate the statistical variation of linear stability over a large subset of Helios I and II observations of the fast solar wind using a numerical evaluation of the Nyquist stability criterion, accounting for multiple sources of free energy associated with protons and helium including temperature anisotropies and relative drifts. We find that 88% of the surveyed intervals are linearly unstable. The median growth rate of the unstable modes is within an order of magnitude of the turbulent transfer rate, fast enough to potentially impact the turbulent scale-to-scale energy transfer. This rate does not significantly change with radial distance, though the nature of the unstable modes, and which ion components are responsible for driving the instabilities, does vary. The effect of ion-ion collisions on stability is found to be significant; collisionally young wind is much more unstable than collisionally old wind, with very different kinds of instabilities present in the two kinds of wind.
    ISSN
    0004-637X
    DOI
    10.3847/1538-4357/ab5802
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab5802
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    UA Faculty Publications

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