Plasma Emission Processes in a Magnetoactive Plasma

Melrose, D. B.; Sy, WN

doi:10.1071/ph720387

Cited by 96 publications

(50 citation statements)

References 6 publications

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“…Wentzel (1984) therefore proposed that the emission was depolarised to some extent within the source region itself, and that this was inherent to the emission process. For harmonic emission, it was initially thought that the Langmuir waves involved would coalesce head on, and therefore Melrose & Sy (1972); Melrose et al (1978) and the correction by Melrose et al (1980) concluded that harmonic emission must be weakly O-mode polarised. Later work by Willes & Melrose (1997) showed that relaxing the head-on condition allowed stronger polarisation, with less restriction on the participating Langmuir waves.…”

Section: Polarisationmentioning

confidence: 99%

A review of solar type III radio bursts

Reid

Ratcliffe

2014

Res. Astron. Astrophys.

333

217

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Solar type III radio bursts are an important diagnostic tool in the understanding of solar accelerated electron beams. They are a signature of propagating beams of nonthermal electrons in the solar atmosphere and the solar system. Consequently, they provide information on electron acceleration and transport, and the conditions of the background ambient plasma they travel through. We review the observational properties of type III bursts with an emphasis on recent results and how each property can help identify attributes of electron beams and the ambient background plasma. We also review some of the theoretical aspects of type III radio bursts and cover a number of numerical efforts that simulate electron beam transport through the solar corona and the heliosphere.

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Section: Polarisationmentioning

confidence: 99%

A review of solar type III radio bursts

Reid

Ratcliffe

2014

Res. Astron. Astrophys.

333

217

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“…A low degree of polarization is possible, provided that the magnetic field in the source regions is sufficiently weak (Melrose & Sy 1972), but the values ( T1 G) required are implausible. For a more plausible value for the magnetic field, depolarization is required, and Benz & Zlobec (1978) suggested depolarization at a quasi-transverse (QT) region (see x 4.4).…”

Section: Type III Emissionmentioning

confidence: 99%

Depolarization of Radio Bursts Due to Reflection off Sharp Boundaries in the Solar Corona

Melrose

2006

ApJ

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Depolarization of solar radio bursts requires reflection off boundary layers no thicker than about a wavelength (a few meters at most) between regions with large density ratios. The implied inhomogeneities suggest that the corona is much more highly and sharply structured than can be resolved from observations at other wavelengths. A simplified version of magnetoionic theory is used to derive a depolarization coefficient; the effect of the magnetic field is ignored in treating the dispersion, but taken into account in treating the (circular) polarization. Plots of the depolarization coefficient are used to infer conditions under which effective depolarization occurs, and it is concluded that favorable conditions require total internal reflection. For type I sources away from the central meridian, effective depolarization requires reflection off an overdense structure with a density ratio % 10. For type III bursts, a density ratio % 2 suffices, with at least two reflections off walls of ducts at %20 to the radial.

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“…where ε i j , ω, and k are the tensor of dielectric permeability, frequency, and wave vector for the considered wave type, respectively. The parameter R(k) is determined by (Melrose & Sy 1972;Willes & Robinson 1996) R(k) = ω ∂(ω 2 )/∂ω , = a * i (k)ε i j (ω, k)a j (k).…”

Section: Resultsmentioning

confidence: 99%

Generation of microwave bursts with zebra pattern by nonlinear interaction of Bernstein modes

Kuznetsov¹

2005

A&A

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Abstract. The processes of generation and nonlinear interaction of Bernstein modes are investigated. The physical conditions considered correspond here to the sources of microwave bursts with a zebra pattern. It is shown that the simultaneous generation of plasma waves corresponding to several cyclotron harmonics is possible under these conditions. Nonlinear coupling of plasma waves results in formation of a zebra pattern with a frequency separation between the adjacent stripes close to the electron cyclotron frequency. The emission is confined in the narrow angle interval near the transversal (relative to the magnetic field) propagation direction. Polarization of emission in this process corresponds to the extraordinary wave, and the polarization degree reaches 100%.

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Plasma Emission Processes in a Magnetoactive Plasma

Cited by 96 publications

References 6 publications

A review of solar type III radio bursts

A review of solar type III radio bursts

Depolarization of Radio Bursts Due to Reflection off Sharp Boundaries in the Solar Corona

Generation of microwave bursts with zebra pattern by nonlinear interaction of Bernstein modes

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