Effects of Heavy Ions on ULF Wave Resonances Near the Equatorial Region

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Pc1-2 ULF waves are strongly associated with the presence of various ions in the magnetosphere. We investigate the role of heavy ion resonances in nonuniform plasmas near the equatorial region. By adopting the invariant imbedding method, the coupled plasma wave equations are solved in an exact manner to calculate the resonant absorption at the ion-ion hybrid resonance. Our results show that irreversible mode conversion occurs at the resonance, which absorbs the fast wave energy. It is found that waves near the resonances appear with linear polarization, and their amplitude and frequency are sensitive to the properties of the heavy ion ... continued below

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D.-H.Lee, J.R. Johnson, K. Kim and K.-S.Kim November 20, 2008.

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Pc1-2 ULF waves are strongly associated with the presence of various ions in the magnetosphere. We investigate the role of heavy ion resonances in nonuniform plasmas near the equatorial region. By adopting the invariant imbedding method, the coupled plasma wave equations are solved in an exact manner to calculate the resonant absorption at the ion-ion hybrid resonance. Our results show that irreversible mode conversion occurs at the resonance, which absorbs the fast wave energy. It is found that waves near the resonances appear with linear polarization, and their amplitude and frequency are sensitive to the properties of the heavy ion plasma composition. We examine how these resonances occur for various H+ - He+ populations in detail by performing an accurate calculation of the mode conversion effciency. Because the multi-ion hybrid resonance locations in cold plasmas are determined by simple parameters such as the fraction of the ion number density of each species and the magnetic field, we suggest that it is possible to monitor heavy ion composition by examining the peak frequencies of linearly polarized wave events in either electric field or magnetic field spectral data.

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766KB

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Vol. 113, A11212

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  • Journal of Geophysical Research

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  • Report No.: PPPL-4368
  • Grant Number: DE-AC02-76Cho3073
  • DOI: 10.2172/941505 | External Link
  • Office of Scientific & Technical Information Report Number: 941505
  • Archival Resource Key: ark:/67531/metadc898883

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  • November 20, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 18, 2016, 10:11 p.m.

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D.-H.Lee, J.R. Johnson, K. Kim and K.-S.Kim. Effects of Heavy Ions on ULF Wave Resonances Near the Equatorial Region, report, November 20, 2008; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc898883/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.