Pulsed currents carried by whistlers. V. Detailed new results of magnetic antenna excitation

Rousculp, C. L.; Stenzel, R. L.; Urrutia, J. M.

doi:10.1063/1.871031

Cited by 49 publications

(31 citation statements)

References 22 publications

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“…As the diagnostics improved the complete time-space dependence of whistler modes has been mapped [85]. Fourier transformation into ω − k space allowed a meaningful comparison between observation and plane wave theory [86]. From 3D spatial data the current density [87] and magnetic helicity [88] have been obtained unambiguously.…”

Section: Gaseous Plasmasmentioning

confidence: 98%

Whistler waves with angular momentum in space and laboratory plasmas and their counterparts in free space

Stenzel

2016

Advances in Physics: X

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Electromagnetic waves with helical phase surfaces arise in different fields of physics such as space plasmas, laboratory plasmas, solid-state physics, atomic, molecular and optical sciences. Their common features are the wave orbital angular momentum associated with the circular wave propagation around the axis of wave propagation. In plasmas these waves are called helicons. When particles or waves change the field momentum they experience a pressure and a torque which can lead to useful applications. In plasmas electrons can damp or excite rotating whistlers, depending on the electron distribution function in velocity space. A magnetized plasma is an anisotropic medium in which electromagnetic waves propagate differently than in space. Phase and group velocities are different such that wave focusing and wave reflections are different from those in free space. Electrons experience Doppler shifts and cyclotron resonance which creates wave damping and growth. All media exhibit nonlinear effects which do not occur in free space. Common and different features of vortex waves in different fields will be reviewed. However, a comprehensive review of this vast field is not possible and further readings are referred to the cited literature. ARTICLE HISTORY

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Section: Gaseous Plasmasmentioning

confidence: 98%

Whistler waves with angular momentum in space and laboratory plasmas and their counterparts in free space

Stenzel

2016

Advances in Physics: X

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“…5 Some of the more recent laboratory experiments dealing with more complex nonlinear effects are from Refs. [6][7][8][9]. Laboratory experiments such as these isolate particular effects under controlled and repeatable conditions, which are difficult to achieve with in situ experiments using ground based antennas, sounding rockets, and satellites.…”

Section: Introductionmentioning

confidence: 98%

Whistler wave propagation in the antenna near and far fields in the Naval Research Laboratory Space Physics Simulation Chamber

2010

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In previous papers, early whistler propagation measurements were presented [W. E. Amatucci et al., IEEE Trans. Plasma Sci. 33, 637 (2005)] as well as antenna impedance measurements [D. D. Blackwell et al., Phys. Plasmas 14, 092106 (2007)] performed in the Naval Research Laboratory Space Physics Simulation Chamber (SPSC). Since that time there have been major upgrades in the experimental capabilities of the laboratory in the form of improvement of both the plasma source and antennas. This has allowed access to plasma parameter space that was previously unattainable, and has resulted in measurements that provide a significantly clearer picture of whistler propagation in the laboratory environment. This paper presents some of the first whistler experimental results from the upgraded SPSC. Whereas previously measurements were limited to measuring the cyclotron resonance cutoff and elliptical polarization indicative of the whistler mode, now it is possible to experimentally plot the dispersion relation itself. The waves are driven and detected using balanced dipole and loop antennas connected to a network analyzer, which measures the amplitude and phase of the wave in two dimensions (r and z). In addition the frequency of the signals is also swept over a range of several hundreds of megahertz, providing a comprehensive picture of the near and far field antenna radiation patterns over a variety of plasma conditions. The magnetic field is varied from a few gauss to 200 G, with the density variable over at least 3 decades from 107 to 1010 cm−3. The waves are shown to lie on the dispersion surface for whistler waves, with observation of resonance cones in agreement with theoretical predictions. The waves are also observed to propagate without loss of amplitude at higher power, a result in agreement with previous experiments and the notion of ducted whistlers.

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“…[2][3][4][5][6][7][8][9] As for whistlers, excitation and propagation has been carried out in large plasma systems 2,6-9 devoid of boundary effects. These experiments, apart from establishing the formation of these EMHD waves through dispersion and propagation characteristics, have also revealed their complex field topology.…”

Section: Introductionmentioning

confidence: 99%

Electron magneto-hydrodynamic waves bounded by magnetic bubble

et al. 2012

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The propagation of electron magneto-hydrodynamic (EMHD) waves is studied experimentally in a 3-dimensional region of low magnetic field surrounded by stronger magnetic field at its boundaries. We report observations where bounded left hand polarized Helicon like EMHD waves are excited, localized in the region of low magnetic field due to the boundary effects generated by growing strengths of the ambient magnetic field rather than a conducting or dielectric material boundary. An analytical model is developed to include the effects of radially nonuniform magnetic field in the wave propagation. The bounded solutions are compared with the experimentally obtained radial wave magnetic field profiles explaining the observed localized propagation of waves. V C 2012 American Institute of Physics. [http://dx.

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Pulsed currents carried by whistlers. V. Detailed new results of magnetic antenna excitation

Cited by 49 publications

References 22 publications

Whistler waves with angular momentum in space and laboratory plasmas and their counterparts in free space

Whistler waves with angular momentum in space and laboratory plasmas and their counterparts in free space

Whistler wave propagation in the antenna near and far fields in the Naval Research Laboratory Space Physics Simulation Chamber

Electron magneto-hydrodynamic waves bounded by magnetic bubble

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