Kinetic Alfven waves and plasma transport at the magnetopause

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Description

Large amplitude compressional type waves, with frequencies ranging from 10--500 mHz, are nearly always found in the magnetosheath near the magnetopause where there are large gradients in density, pressure and magnetic field. As compressional waves propagation to the magnetopause, there gradients efficiently couple them with shear/kinetic Alfven waves near the Alfven field-line resonance location ({omega} = k{sub {parallel}} v{sub A}). The authors present a solution of the kinetic-MHD wave equations for this process using a realistic equilibrium profile including full ion Larmor radius effects and wave-particle resonance interactions for electrons and ions to model the dissipation. For northward IMF a ... continued below

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14 p.

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Johnson, J.R. & Cheng, C.Z. May 1, 1997.

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Description

Large amplitude compressional type waves, with frequencies ranging from 10--500 mHz, are nearly always found in the magnetosheath near the magnetopause where there are large gradients in density, pressure and magnetic field. As compressional waves propagation to the magnetopause, there gradients efficiently couple them with shear/kinetic Alfven waves near the Alfven field-line resonance location ({omega} = k{sub {parallel}} v{sub A}). The authors present a solution of the kinetic-MHD wave equations for this process using a realistic equilibrium profile including full ion Larmor radius effects and wave-particle resonance interactions for electrons and ions to model the dissipation. For northward IMF a KAW propagates backward to the magnetosheath. For southward IMF the wave remains in the magnetopause but can propagate through the k{sub {parallel}} = 0 location. The quasi-linear theory predicts that KAWs produce plasma transport with a diffusion coefficient D{sub {perpendicular}} {approximately} 10{sup 9} m{sup 2}/s and plasma convection on the order of 1 km/s. However, for southward IMF additional transport can occur because magnetic islands form at the k{sub {parallel}} = 0 location. Due to the broadband nature of the observed waves these islands can overlap leading to stochastic transport which is much larger than that due to quasilinear effects.

Physical Description

14 p.

Notes

Also available from the following url: http://www.pppl.gov. See PPPL reports section for full text.; OSTI as DE97052374

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  • Other Information: PBD: [1997]

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  • Other: DE97052374
  • Report No.: PPPL--3232
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/304098 | External Link
  • Office of Scientific & Technical Information Report Number: 304098
  • Archival Resource Key: ark:/67531/metadc679025

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  • May 1, 1997

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 23, 2016, 3:08 p.m.

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Johnson, J.R. & Cheng, C.Z. Kinetic Alfven waves and plasma transport at the magnetopause, report, May 1, 1997; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc679025/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.