Observations of ion cyclotron waves near synchronous orbit and on the ground

Fraser, B. J.

doi:10.1007/bf00214993

Cited by 77 publications

(32 citation statements)

References 44 publications

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“…The wave growth rates are controlled by the ring current anisotropy, ion composition, and cold plasma density (Kozyra et al, 1984;Horne and Thorne, 1998). For a detailed review of EMIC waves, see Fraser (1985), Anderson et al (1992), and Millan and Thorne (2006 Global statistical models of the average intensities of equatorial (À151ol m o151) plasmaspheric hiss derived from Combined Release and Radiation Effects Satellite (CRRES) observations are shown as a function of L and MLT for different levels of magnetic activity in the top panels of Fig. 3 (Meredith et al, 2004).…”

Section: Major Types Of Waves Capable Of Violating the First And Secomentioning

confidence: 99%

Review of modeling of losses and sources of relativistic electrons in the outer radiation belt II: Local acceleration and loss

Shprits

Subbotin

Meredith

et al. 2008

Journal of Atmospheric and Solar-Terrestrial Physics

404

433

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Section: Major Types Of Waves Capable Of Violating the First And Secomentioning

confidence: 99%

Review of modeling of losses and sources of relativistic electrons in the outer radiation belt II: Local acceleration and loss

Shprits

Subbotin

Meredith

et al. 2008

Journal of Atmospheric and Solar-Terrestrial Physics

404

433

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“…According to the statistical studies of satellite observations such as of Anderson et al [1992a, 1992b] and Fraser and Nguyen [2001], it is evident that the wave events near the equatorial region have unique features. One property is that wave events with linear polarization are frequently observed [ Young et al , 1981; Fraser and McPherron , 1982; Fraser , 1985; Anderson et al , 1992b, 1996; Fraser and Nguyen , 2001]. The dispersion relation of heavy ions indicates that any branch of the wave mode should be predominantly left‐hand (L) or right‐hand (R) polarized except for a few exceptions near the crossover frequency or at oblique propagation near the multi‐ion hybrid resonances [e.g., Rauch and Roux , 1982; Fraser , 1985].…”

Section: Introductionmentioning

confidence: 99%

“…One property is that wave events with linear polarization are frequently observed [ Young et al , 1981; Fraser and McPherron , 1982; Fraser , 1985; Anderson et al , 1992b, 1996; Fraser and Nguyen , 2001]. The dispersion relation of heavy ions indicates that any branch of the wave mode should be predominantly left‐hand (L) or right‐hand (R) polarized except for a few exceptions near the crossover frequency or at oblique propagation near the multi‐ion hybrid resonances [e.g., Rauch and Roux , 1982; Fraser , 1985]. Because wave surveys involve a wide range of observed frequency relative to the ion cyclotron frequency, it is highly unusual that a significant number of wave events are linearly polarized.…”

Section: Introductionmentioning

confidence: 99%

Effects of heavy ions on ULF wave resonances near the equatorial region

Lee

Kim

2008

J. Geophys. Res.

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[1] 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 efficiency. 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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“…[1][2][3][4][5][6][7][8][9][10][11] Previous nonlinear studies have typically considered this mode operating in isolation with the plasma stable to other instabilities. [12][13][14][15] Exceptions include the competitive interaction of the proton cyclotron anisotropy instability and the mirror instability, which has been studied for nondrifting components.…”

Section: Introductionmentioning

confidence: 99%

Quasilinear evolution of the ion cyclotron beam-anisotropy instability in a current carrying plasma

Chaston

Fraser

1999

Physics of Plasmas

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The evolution of particle velocity moments and wave spectra during the quasilinear saturation of the proton beam-anisotropy instability in a current carrying plasma is studied. For initial plasma moments characteristic of the near-Earth plasma sheet boundary layer, it is found that the saturation of the ion beam-anisotropy instability drives a field-aligned current, which self-consistently excites a kink-like mode. The driven current allows the wave fields of current driven mode to grow to amplitudes comparable to that of the anisotropy instability and facilitates more rapid isotropization of the unstable anisotropic beam components and saturation of the beam-anisotropy instability. This work has general relevance to the study of field-aligned instabilities in plasmas where the excited waves carry a net momentum density away from the source of instability.

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Observations of ion cyclotron waves near synchronous orbit and on the ground

Cited by 77 publications

References 44 publications

Review of modeling of losses and sources of relativistic electrons in the outer radiation belt II: Local acceleration and loss

Review of modeling of losses and sources of relativistic electrons in the outer radiation belt II: Local acceleration and loss

Effects of heavy ions on ULF wave resonances near the equatorial region

Quasilinear evolution of the ion cyclotron beam-anisotropy instability in a current carrying plasma

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