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dc.contributor.authorKlein, Kristopher G.
dc.contributor.authorMartinović, Mihailo
dc.contributor.authorStansby, David
dc.contributor.authorHorbury, Timothy S.
dc.date.accessioned2020-02-04T19:34:06Z
dc.date.available2020-02-04T19:34:06Z
dc.date.issued2019-12-23
dc.identifier.citationKristopher G. Klein et al 2019 ApJ 887 234en_US
dc.identifier.issn0004-637X
dc.identifier.doi10.3847/1538-4357/ab5802
dc.identifier.urihttp://hdl.handle.net/10150/636906
dc.description.abstractWave-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.en_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rightsCopyright © 2019. The American Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://iopscience.iop.org/info/page/text-and-data-mining
dc.titleLinear Stability in the Inner Heliosphere: Helios Re-evaluateden_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizonaen_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis 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.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Astrophysical Journal
dc.source.volume887
dc.source.issue2
dc.source.beginpage234
refterms.dateFOA2020-02-04T19:34:06Z


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