A New Scenario for Type III Solar Radio Emission

Wu, C. S.; Yoon, Peter H.; Li, Y.

doi:10.1086/309308

Cited by 11 publications

(11 citation statements)

References 47 publications

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“…The linear mode coupling in an inhomogenous plasma was studied in ionospheric sounding (Budden 1961) as well as in the solar corona (Melrose 1980). The process of the linear mode conversion from the Bernstein mode to the X-mode was proposed by Wu et al (2000). They explained that the harmonics of electron Bernstein waves above the X-mode cutoff frequency are excited by the energetic elec-trons propagating parallel to the magnetic field through the cyclotron wave-particle interaction.…”

Section: Simulation Modelmentioning

confidence: 99%

The Emission of Electromagnetic Waves during the Coalescence of Two Parallel Current Loops in Solar Flares

Saito¹,

Sakai²

2004

ApJ

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We investigate the emission process of electromagnetic waves during the coalescence of two parallel current loops with counterhelicity. It is shown that the jetlike electrons accelerated during the coalescence process excite the electron Bernstein waves because of the interaction between the energetic electrons and the magnetic fields surrounding two current loops. In the interaction region there appears a thin density gap, from which the electromagnetic waves propagate perpendicular to the magnetic field as extraordinary electromagnetic waves (Xmode). We found that the electron Bernstein waves in the high-density plasma are converted to the X-mode in the low-density plasma through the linear mode conversion process because of the density inhomogeneity.

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Section: Simulation Modelmentioning

confidence: 99%

The Emission of Electromagnetic Waves during the Coalescence of Two Parallel Current Loops in Solar Flares

Saito¹,

Sakai²

2004

ApJ

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“…Winglee & Dulk (1986a) proposed that the type V continua result from the coalescence of hybrid waves driven by the ECM instability, but type III bursts are produced by the plasma emission process. Wu et al (2000Wu et al ( , 2002 propose that type V and III bursts may result from the same physical processes since the two phenomena are closely associated.…”

Section: Introductionmentioning

confidence: 99%

Electron Cyclotron Maser Emission in Coronal Arches and Solar Radio Type v Bursts

Tang

Tan

2013

ApJ

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Solar radio type V bursts were classified as a special spectral class based on their moderately long duration, wide bandwidth, and sense of polarization opposite of associated type III bursts. However, type V bursts are also closely related to the preceding type III bursts. They have an approximately equal source height and the same dispersion of position with frequency. Electron cyclotron maser (ECM) instability driven by beam electrons has been used to explain type III bursts in recent years. We propose ECM emission as the physical process of type V solar radio bursts. According to the observed properties of type V and III bursts, we propose that energetic electrons in excited type V continuum are trapped in coronal loops, which are adjacent to the open field lines traced by type III electrons. With the proposed magnetic field configuration and the ECM emission mechanism, the observed properties of type V bursts, such as long duration, wide bandwidth, and opposite sense of polarization can be reasonably explained by our model.

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“…Such a conversion is likely to be a natural consequence of a plasma immersed in a nonuniform magnetic field. From the standpoint of radiophysics, the excitation of Bernstein waves and subsequent linear mode conversion to electromagnetic waves 7 constitute an entirely new mechanism to produce radio emission, which has not been considered before.…”

Section: Introductionmentioning

confidence: 99%

“…However, the above electrostatic dispersion relation is sufficient if the purpose is just to describe the wave properties of Bernstein waves. 7 The approximation scheme employed in Ref. 2 amounts to the following treatment of Eq.…”

Section: Introductionmentioning

confidence: 99%

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Maser-beam instability of Bernstein waves

Ziebell

Yoon

2000

Physics of Plasmas

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The present study constitutes a continuation and improvement of the preceding work by Yoon et al. [J. Geophys. Res. 104, 19801 (1999)]. In the present discussion, an instability of Bernstein waves excited by a beam of energetic electrons is investigated. Special attention is paid to the regime where the ratio of plasma frequency, ωpe, to electron gyrofrequency, Ωe, is sufficiently higher than unity. An approximate but fairly accurate scheme is introduced to deal with the situation dictated by the condition, ωpe2/Ωe2≫1. The present investigation is motivated by the research in solar radiophysics. However, in this article the emphasis is placed on basic properties of the instability rather than its application.

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A New Scenario for Type III Solar Radio Emission

Cited by 11 publications

References 47 publications

The Emission of Electromagnetic Waves during the Coalescence of Two Parallel Current Loops in Solar Flares

The Emission of Electromagnetic Waves during the Coalescence of Two Parallel Current Loops in Solar Flares

Electron Cyclotron Maser Emission in Coronal Arches and Solar Radio Type v Bursts

Maser-beam instability of Bernstein waves

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