Global structure of mirror modes in the magnetosheath

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Description

A global stability analysis of mirror modes in the magnetosheath is presented. The analysis is based upon the kinetic-MHD formulation which includes relevant kinetic effects such as Landau resonance and gradient drift effects related to inhomogeneities in the background density, temperature, pressure and its anisotropy, magnetic field, and plasma flow velocity. Pressure anisotropy provides the free energy for the global mirror mode. The local theory of mirror modes predicts purely growing modes confined in the unstable magnetosheath region; however, the nonlocal theory that includes the effects of gradients and plasma flow predicts modes with real frequencies which propagate with the ... continued below

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24 p.

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Johnson, J.R. & Cheng, C.Z. November 1, 1996.

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Description

A global stability analysis of mirror modes in the magnetosheath is presented. The analysis is based upon the kinetic-MHD formulation which includes relevant kinetic effects such as Landau resonance and gradient drift effects related to inhomogeneities in the background density, temperature, pressure and its anisotropy, magnetic field, and plasma flow velocity. Pressure anisotropy provides the free energy for the global mirror mode. The local theory of mirror modes predicts purely growing modes confined in the unstable magnetosheath region; however, the nonlocal theory that includes the effects of gradients and plasma flow predicts modes with real frequencies which propagate with the flow from the magnetosheath toward the magnetopause boundary. The real frequency is on the order of a combination of the diamagnetic drift frequency and the Doppler shift frequency associated with plasma flow. The diamagnetic drift frequency provides a wave phase velocity in the direction of the magnetopause so that wave energy accumulates against the magnetopause boundary, and the amplitude is skewed in that direction. On the other hand, plasma flow also gives rise to a real phase velocity, but the phase velocity is smaller than the flow velocity. As a result, the wave amplitude is increased in the wake of the plasma flow and piles up against the bow shock boundary.

Physical Description

24 p.

Notes

Also available from the following url: http://www.pppl.gov. See PPPL reports section for full text.; OSTI as DE97050299

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  • Other Information: PBD: [1996]

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  • Other: DE97050299
  • Report No.: PPPL--3210
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/304197 | External Link
  • Office of Scientific & Technical Information Report Number: 304197
  • Archival Resource Key: ark:/67531/metadc675755

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  • November 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 15, 2016, 8:06 p.m.

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Johnson, J.R. & Cheng, C.Z. Global structure of mirror modes in the magnetosheath, report, November 1, 1996; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc675755/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.