Signatures of mode conversion and kinetic Alfven waves at the magnetopause

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It has been suggested that resonant mode conversion of compressional MHD waves into kinetic Alfven waves at the magnetopause can explain the abrupt transition in wave polarization from compressional to transverse commonly observed during magnetopause crossings. The authors analyze magnetic field data for magnetopause crossings as a function of magnetic shear angle (defined as the angle between the magnetic fields in the magnetosheath and magnetosphere) and compare with the theory of resonant mode conversion. The data suggest that amplification in the transverse magnetic field component at the magnetopause is not significant up to a threshold magnetic shear angle. Above the ... continued below

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572 Kilobytes pages

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Johnson, Jay R. & Cheng, C. Z. July 21, 2000.

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Description

It has been suggested that resonant mode conversion of compressional MHD waves into kinetic Alfven waves at the magnetopause can explain the abrupt transition in wave polarization from compressional to transverse commonly observed during magnetopause crossings. The authors analyze magnetic field data for magnetopause crossings as a function of magnetic shear angle (defined as the angle between the magnetic fields in the magnetosheath and magnetosphere) and compare with the theory of resonant mode conversion. The data suggest that amplification in the transverse magnetic field component at the magnetopause is not significant up to a threshold magnetic shear angle. Above the threshold angle significant amplification results, but with weak dependence on magnetic shear angle. Waves with higher frequency are less amplified and have a higher threshold angle. These observations are qualitatively consistent with theoretical results obtained from the kinetic-fluid wave equations.

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572 Kilobytes pages

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INIS; OSTI as DE00758722

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  • Other Information: PBD: 21 Jul 2000

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  • Report No.: PPPL-3477
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/758722 | External Link
  • Office of Scientific & Technical Information Report Number: 758722
  • Archival Resource Key: ark:/67531/metadc703047

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  • July 21, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 18, 2016, 1:04 p.m.

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Johnson, Jay R. & Cheng, C. Z. Signatures of mode conversion and kinetic Alfven waves at the magnetopause, report, July 21, 2000; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc703047/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.