Three dimensional character of whistler turbulence

Ganguli, G.; Rudakov, L. I.; Scales, W. A.; Wang, Joseph Che Yen; Mithaiwala, Manish

doi:10.1063/1.3420245

Cited by 77 publications

(95 citation statements)

References 25 publications

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“…[15] Also noticeable in Figure 2 (bottom) are the multiple bands of diffuse, plasma waves that extend beyond the stronger, whistler sferics within the VLF band, possibly associated with lower hybrid waves [e.g., Kelley et al, 1985], or with enhanced turbulence caused by nonlinear scattering, as suggested by Ganguli et al [2010]. At this location, we calculate the lower hybrid frequency to be near 10 kHz, since the plasma was ∼90% Hydrogen, as determined by the onboard RPA measurements.…”

Section: Instrumentation and Data Examplesmentioning

confidence: 99%

Lightning-generated whistler waves observed by probes on the Communication/Navigation Outage Forecast System satellite at low latitudes

et al. 2011

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Direct evidence is presented for a causal relationship between lightning and strong electric field transients inside equatorial ionospheric density depletions. In fact, these whistler mode plasma waves may be the dominant electric field signal within such depletions. Optical lightning data from the Communication/Navigation Outage Forecast System (C/NOFS) satellite and global lightning location information from the World Wide Lightning Location Network are presented as independent verification that these electric field transients are caused by lightning. The electric field instrument on C/NOFS routinely measures lightning‐related electric field wave packets or sferics, associated with simultaneous measurements of optical flashes at all altitudes encountered by the satellite (401–867 km). Lightning‐generated whistler waves have abundant access to the topside ionosphere, even close to the magnetic equator.

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Section: Instrumentation and Data Examplesmentioning

confidence: 99%

Lightning-generated whistler waves observed by probes on the Communication/Navigation Outage Forecast System satellite at low latitudes

et al. 2011

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“…, and E kz = E kx kz k x , respectively, as shown in Ganguli et al [2010]. The resonant phase velocity, v res ! "…”

Section: ) Diminished Landau Damping Of Whistlers In the Solar Windmentioning

confidence: 99%

Co-existence of whistler waves with kinetic Alfven wave turbulence for the high-beta solar wind plasma

et al. 2012

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It is shown that the dispersion relation for whistler waves is identical for a high or low beta plasma. Furthermore in the high-beta solar wind plasma whistler waves meet the Landau resonance with electrons for velocities less than the thermal speed, and consequently the electric force is small compared to the mirror force. As whistlers propagate through the inhomogeneous solar wind, the perpendicular wave number increases through refraction, increasing the Landau damping rate. However, the whistlers can survive because the background kinetic Alfven wave turbulence creates a plateau by quasilinear diffusion in the solar wind electron distribution at small velocities. It is found that for whistler energy density of only ~10 -3 that of the kinetic Alfven waves, the quasilinear diffusion rate due to whistlers is comparable to KAW. Thus very small amplitude whistler turbulence can have a significant consequence on the evolution of the solar wind electron distribution function.

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“…et. al 29 ), and they can be generalized as figure 7(b), the dispersion relation is sometimes referred as the electrostatic whistler waves. Finally, we suggest electron-ion hybrid (EIH) mode is a possible candidate of the LH mode.…”

Section: Discussion and Space Applicationmentioning

confidence: 99%

Laboratory experiments in the argon plasma perturbed by injections of the electronegative gases

et al. 2016

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In this study, laboratory observations of the perturbations of the magnetic field are reported due to the injection of attachment chemicals (CF4, SF6, and CO2) into argon plasmas. Besides the well-known electron density reduction, we also observed magnetic field perturbation in the experiment. The measured induced voltage Ḃ, which is taken as a proxy of the time-changing electromagnetic field, fluctuates in the boundary layer between the ambient plasmas and negative ions plasmas. Perturbations of the magnetic field were investigated by changing the ambient pressure and ratio of attachment chemicals. The measured Ḃ keeps increasing in these lower pressures; but it no longer increases as the ambient pressure higher than a threshold, e.g., for CF4, SF6, and CO2, the transition pressure is 6Pa, 5Pa and 4Pa, respectively. The magnitude of the Ḃ increase with the change of the ratio of release flow until at higher ratios, e.g., 40%. We transformed these time-sampled data into the frequency domain and found coherent modes with fundamental frequencies lying in the lower hybrid range. In addition, these coherent frequencies show a frequency drift with the increase of the contents of the negative ions. These modes were suggested as the magnetic component of electron-ion hybrid mode. This work has an important application in the study of artificially-created ionospheric depletion which is usually generated by releasing of attachment chemicals in the upper atmosphere.

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Three dimensional character of whistler turbulence

Cited by 77 publications

References 25 publications

Lightning-generated whistler waves observed by probes on the Communication/Navigation Outage Forecast System satellite at low latitudes

Lightning-generated whistler waves observed by probes on the Communication/Navigation Outage Forecast System satellite at low latitudes

Co-existence of whistler waves with kinetic Alfven wave turbulence for the high-beta solar wind plasma

Laboratory experiments in the argon plasma perturbed by injections of the electronegative gases

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