The electron-cyclotron maser instability as a source of plasma radiation

Winglee, R. M.; Dulk, G. A.

doi:10.1086/164467

Cited by 168 publications

(151 citation statements)

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“…In this case the electromagnetic emission arises due to nonlinear coupling of Bernstein waves with each other or with upper-hybrid plasma waves (Rosenberg 1972;Chiuderi et al 1973;Zheleznyakov & Zlotnik 1975a, 1975bMollwo & Sauer 1977;Zaitsev & Stepanov 1983). The generation of several cyclotron harmonics of upper-hybrid waves with the subsequent conversion into radio emission was suggested also by Winglee & Dulk (1986). In these models the frequency separation between the adjacent stripes is close to the electron cyclotron frequency.…”

Section: Introductionmentioning

confidence: 96%

On the origin of microwave zebra pattern

Altyntsev

Kuznetsov

Meshalkina

et al. 2005

A&A

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Abstract.The results of the first observations of a zebra pattern at frequencies around 5.6 GHz are presented. The fine structures in the emission spectrum were recorded simultaneously by the Siberian Solar Radiotelescope and the spectropolarimeters of the National Astronomical Observatories, which allowed us to study the presented event with high spatial, temporal and spectral resolution. The apparent source size does not exceed 10 arcsec, and the sources of the different stripes of the zebra structure coincide spatially. The circular polarization degree reaches 100%, and the polarization sense corresponds to the extraordinary wave. We argue that the most probable generation mechanism of the zebra pattern is nonlinear coupling of Bernstein waves. In this case the value of the magnetic field in the burst source, determined by the frequency separation between the adjacent stripes, is 60-80 G.

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Section: Introductionmentioning

confidence: 96%

On the origin of microwave zebra pattern

Altyntsev

Kuznetsov

Meshalkina

et al. 2005

A&A

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“…Many mechanisms have been proposed to explain them (Kuijpers 1975;Zheleznyakov & Zlotnik 1975;Chernov 1976;Mollwo 1983;Winglee & Dulk 1986;Ledenev et al 2001;Yasnov & Karlický 2004;Bárta & Karlický 2006;LaBelle et al 2003;Kuznetsov & Tsap 2007;Zlotnik 2013); for review of these models, see Chernov (2010).…”

Section: Introductionmentioning

confidence: 99%

Radio continua modulated by waves: Zebra patterns in solar and pulsar radio spectra?

Karlický

2013

A&A

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Aims. We aim to answer the question how waves with plasma density variations affect the radio continua generated by the plasma emission mechanism. Methods. We built a simple semi-empirical model of the radio continuum modulation. Assuming that the waves with density variations are in the source of this radio continuum, we modeled the artificial radio spectrum, which we compared with observed spectra. Results. We show that the waves with density variations modulate the radio continua generated by the plasma emission mechanism. Considering a single slow magnetoacoustic wave, we model the radio spectra, which resemble solar zebra patterns. We show that this modulation generates zebra effects even when the radio continuum is composed of many spiky bursts. Generalizing from one single wave to a wave turbulence we find that the computed radio spectrum is similar to so-called lace bursts. Finally, using the same procedure, but for fast magnetoacoustic waves, we modeled the radio spectrum similar to that observed during the interpulse phase of the radio emission of the Crab Nebula pulsar.

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“…Winglee and Dulk (1986) and Yoon et al (1998) have considered the higher-order cyclotron maser in a condition of ω p / e > 1 but focused on UHR (slow Z) waves. Our mechanism concerns the generation of fast Z-mode waves in high density background, where it has been considered to be difficult to excite electromagnetic waves.…”

Section: Discussionmentioning

confidence: 99%

Generation mechanism of Z-mode waves in the equatorial plasmasphere

et al. 2007

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In order to clarify the generation mechanism of Z-mode waves observed in the equatorial plasmasphere, the growth rate of Z-mode electromagnetic waves has been calculated under the higher-order cyclotron interaction process. Z-mode waves can interact with some tens of keV electrons with large pitch angles even in the dense cold background, and the amplitude is consistent with the Akebono plasma wave measurements. UHR and whistler mode waves are also excited by the same electron distribution, and this is also consistent with observations. The origin of these energetic electrons are identified as the ring current electrons injected into the plasmasphere by the intense large-scale electric field during geomagnetic storms, accelerated perpendicular to the ambient magnetic field and confined around the geomagnetic equator conserving the first and second adiabatic invariants. Since the intensity of Z-mode and UHR waves is associated with the development and decay of the ring current, ring current particles are most possible candidate for the free energy source of these waves.

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The electron-cyclotron maser instability as a source of plasma radiation

Cited by 168 publications

References 0 publications

On the origin of microwave zebra pattern

On the origin of microwave zebra pattern

Radio continua modulated by waves: Zebra patterns in solar and pulsar radio spectra?

Generation mechanism of Z-mode waves in the equatorial plasmasphere

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