Abstract
The authors present observations of electromagnetic emissions near electron cyclotron harmonics from mirror-confined laboratory plasma during electron cyclotron resonance heating by microwaves, and attribute them to electron cyclotron instabilities.
Highlights
Electron cyclotron instabilities are of great importance for the wave-particle dynamics and overall energy balance in the near-Earth plasma environment [1], while in the solar wind, cyclotron instabilities limit the particle distribution function and put a bound on the electron temperature anisotropy [2,3]
The auroral kilometric radiation (AKR) is attributed to electromagnetic instability due to electrons compressed in the converging magnetic field of planetary auroral regions, yielding horseshoe distributions giving maser emission into intense X-mode radiation [4], while similar emissions are observed to occur in other astrophysical environments [5,6]
Our results show that electrostatic electron cyclotron instabilities can be studied in a mirror-confined electron cyclotron resonance (ECR) discharge where a combination of warm, ring-distributed electrons and a much colder population of electrons occur naturally
Summary
Electron cyclotron instabilities are of great importance for the wave-particle dynamics and overall energy balance in the near-Earth plasma environment [1], while in the solar wind, cyclotron instabilities limit the particle distribution function and put a bound on the electron temperature anisotropy [2,3]. The auroral kilometric radiation (AKR) is attributed to electromagnetic instability due to electrons compressed in the converging magnetic field of planetary auroral regions, yielding horseshoe distributions giving maser emission into intense X-mode radiation [4], while similar emissions are observed to occur in other astrophysical environments [5,6]. Electron anisotropy gives rise to the electromagnetic electron cyclotron (whistler) instability with frequencies below the electron cyclotron frequency, when the perpendicular temperature is larger than the parallel temperature [7,8,9].
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