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  • 1
    Electronic Resource
    Electronic Resource
    Whistler turbulence at the magnetopause: A nonlinear generation mechanism (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 272-276 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The plasma maser effect in the existence of enhanced kinetic Alfvén wave turbulence is investigated as the generation mechanism of the whistler turbulence at the magnetopause. The numerical results of the growth rate show that on the scale of neither the ion inertial length nor the electron inertial length, the whistler waves can be excited, and the peak of the maximum growth rate occurs on the scale of the effective ion Larmor radius. The kinetic Alfvén wave dynamics associated with the scale length of the effective ion Larmor radius is intrinsically important in the magnetic reconnection and leads to the generation of whistler turbulence. The theoretical model of the generation of whistler turbulence is useful for explaining the observations of intense electromagnetic fluctuations at the magnetopause. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1326063
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Unstable-magnetic-drift waves in a plasma with temperature anisotropy (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 1840-1843 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theory of unstable magnetic-drift waves was first discussed by Krall and Rosenbluth [Phys. Fluids 6, 254 (1963)]. However, the growth rate is exceedingly small and, therefore, the instability seems to be unimportant. It is found in the present analysis that a weak electron temperature anisotropy T⊥〈T(parallel) can lead to a much stronger instability. When there is no temperature gradient, the conditions of the new instability are (c2k2/ω2e+1)(T⊥/T(parallel))−1 〈0, εn/εB〉0, where εn=(1/n)(∂n/∂x) and εB=(1/B)(∂B/∂x). In this case, the instability is attributed to wave–electron interactions, whereas the case discussed by Krall and Rosenbluth [Phys. Fluids 6, 254 (1963)] attributes the instability to wave–ion interactions. A general discussion including a temperature gradient is presented with the usual local approximation which is justifiable when kεn〉1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865613
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Induced emission of radiation near 2ωe by a synchrotron-maser instability (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 846-853 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the literature, the emission of radiation at 2ωe , where ωe denotes the electron plasma frequency, is usually explained as having been produced by the nonlinear interaction of two Langmuir waves via a backscattering process. Since the emission is frequently observed in solar radio bursts, the mechanism has attracted considerable theoretical interest. In the present paper a model is proposed based on a synchrotron-maser instability excited by a hollow beam of moderately relativistic electrons in a plasma, in which the plasma frequency is much higher than the gyrofrequency. An important conclusion is that, as a result of this instability, unpolarized electromagnetic waves with frequencies near 2ωe may be amplified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865053
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear wave interactions and evolution of a ring-beam distribution of energetic electrons (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 2238-2248 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A ring-beam distribution function of moderately relativistic electrons is unstable to electromagnetic and electrostatic waves. The results obtained in numerical simulations show that electromagnetic radiation corresponding to the normal modes of the background plasma is observed to grow even in the presence of a strong electrostatic instability and becomes very strong when the growth of the electrostatic Langmuir waves is minimized, and that the instability process is best described as a beam cyclotron resonance. Another strong radiation generated by the ring beam is the Z mode which is coupled to the electrostatic Langmuir wave. Under certain circumstances, these mechanisms may be significant in astrophysical situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.867003
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    Paper (German National Licenses)
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