View in EDS

Hybrid Simulations of Magnetodisc Transport Driven by the Rayleigh‐Taylor Instability.

Saved in:
Bibliographic Details
Title: Hybrid Simulations of Magnetodisc Transport Driven by the Rayleigh‐Taylor Instability.
Authors: Stauffer, B. H.1, Delamere, P. A.1 padelamere@alaska.edu, Ma, X.2, Neupane, B. R.1, Burkholder, B. L.1
Source: Journal of Geophysical Research. Space Physics. Jul2019, Vol. 124 Issue 7, p5107-5120. 14p.
Subject Terms: Plasma transport processes, Rayleigh-Taylor instability, Magnetosphere, Magnetic fields, Magnetic reconnection
Abstract: Plasma transport in the rapidly rotating giant magnetospheres is thought to involve a centrifugally driven flux tube interchange instability, similar to the Rayleigh‐Taylor (RT) instability. In three dimensions, the convective flow patterns associated with the RT instability can produce strong guide field reconnection, allowing plasma mass to move radially outward while conserving magnetic flux (Ma et al., 2016, https://doi.org/10.1002/2015JA022122). We present a set of hybrid (kinetic ion/fluid electron) plasma simulations of the RT instability using high plasma beta conditions appropriate for the inner and middle magnetosphere at Jupiter and Saturn. A density gradient, combined with a centrifugal force, provide appropriate RT onset conditions. Pressure balance requires only a temperature gradient as the magnetic pressure is constant. Pressure balance is achieved with a temperature gradient in a fixed magnetic field. The three‐dimensional simulation domain represents a local volume of the magnetodisc resonant cavity. Simulated RT growth rates compare favorably with linear theory, where the fundamental mode of the resonant cavity determines the largest (stabilizing) parallel wavelength. We suggest that the perpendicular scale of RT structures is determined by the fundamental mode, which limits growth due to magnetic tension. Finally, we investigated strong guide field magnetic reconnection and diffusive processes as plausible mechanisms to facilitate kinetic‐scale radial transport. Key Points: Hybrid simulations of the Rayleigh‐Taylor instability show magnetic field fluctuations similar to those observed at SaturnThe Rayleigh‐Taylor fingers include diffusive transport, patchy reconnection sites, and kinetic‐scale structures due to an inverse cascadeThe perpendicular scale of the Rayleigh‐Taylor fingers are limited by the parallel wavelengths in the magnetodisc resonant cavity [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: GreenFILE
FullText Text:
  Availability: 0
Header DbId: 8gh
DbLabel: GreenFILE
An: 138274402
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Hybrid Simulations of Magnetodisc Transport Driven by the Rayleigh‐Taylor Instability.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Stauffer%2C+B%2E+H%2E%22">Stauffer, B. H.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Delamere%2C+P%2E+A%2E%22">Delamere, P. A.</searchLink><relatesTo>1</relatesTo><i> padelamere@alaska.edu</i><br /><searchLink fieldCode="AR" term="%22Ma%2C+X%2E%22">Ma, X.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Neupane%2C+B%2E+R%2E%22">Neupane, B. R.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Burkholder%2C+B%2E+L%2E%22">Burkholder, B. L.</searchLink><relatesTo>1</relatesTo>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Jul2019, Vol. 124 Issue 7, p5107-5120. 14p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Plasma+transport+processes%22">Plasma transport processes</searchLink><br /><searchLink fieldCode="DE" term="%22Rayleigh-Taylor+instability%22">Rayleigh-Taylor instability</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetosphere%22">Magnetosphere</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+reconnection%22">Magnetic reconnection</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Plasma transport in the rapidly rotating giant magnetospheres is thought to involve a centrifugally driven flux tube interchange instability, similar to the Rayleigh‐Taylor (RT) instability. In three dimensions, the convective flow patterns associated with the RT instability can produce strong guide field reconnection, allowing plasma mass to move radially outward while conserving magnetic flux (Ma et al., 2016, https://doi.org/10.1002/2015JA022122). We present a set of hybrid (kinetic ion/fluid electron) plasma simulations of the RT instability using high plasma beta conditions appropriate for the inner and middle magnetosphere at Jupiter and Saturn. A density gradient, combined with a centrifugal force, provide appropriate RT onset conditions. Pressure balance requires only a temperature gradient as the magnetic pressure is constant. Pressure balance is achieved with a temperature gradient in a fixed magnetic field. The three‐dimensional simulation domain represents a local volume of the magnetodisc resonant cavity. Simulated RT growth rates compare favorably with linear theory, where the fundamental mode of the resonant cavity determines the largest (stabilizing) parallel wavelength. We suggest that the perpendicular scale of RT structures is determined by the fundamental mode, which limits growth due to magnetic tension. Finally, we investigated strong guide field magnetic reconnection and diffusive processes as plausible mechanisms to facilitate kinetic‐scale radial transport. Key Points: Hybrid simulations of the Rayleigh‐Taylor instability show magnetic field fluctuations similar to those observed at SaturnThe Rayleigh‐Taylor fingers include diffusive transport, patchy reconnection sites, and kinetic‐scale structures due to an inverse cascadeThe perpendicular scale of the Rayleigh‐Taylor fingers are limited by the parallel wavelengths in the magnetodisc resonant cavity [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=8gh&AN=138274402
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1029/2018JA026420
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 14
        StartPage: 5107
    Subjects:
      – SubjectFull: Plasma transport processes
        Type: general
      – SubjectFull: Rayleigh-Taylor instability
        Type: general
      – SubjectFull: Magnetosphere
        Type: general
      – SubjectFull: Magnetic fields
        Type: general
      – SubjectFull: Magnetic reconnection
        Type: general
    Titles:
      – TitleFull: Hybrid Simulations of Magnetodisc Transport Driven by the Rayleigh‐Taylor Instability.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Stauffer, B. H.
      – PersonEntity:
          Name:
            NameFull: Delamere, P. A.
      – PersonEntity:
          Name:
            NameFull: Ma, X.
      – PersonEntity:
          Name:
            NameFull: Neupane, B. R.
      – PersonEntity:
          Name:
            NameFull: Burkholder, B. L.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 07
              Text: Jul2019
              Type: published
              Y: 2019
          Identifiers:
            – Type: issn-print
              Value: 21699380
          Numbering:
            – Type: volume
              Value: 124
            – Type: issue
              Value: 7
          Titles:
            – TitleFull: Journal of Geophysical Research. Space Physics
              Type: main
ResultId 1