Magnetospheric banded chorus is enhanced whistler waves with frequencies ωr <Ω e , where Ω e is the electron cyclotron frequency, and a characteristic spectral gap at ωr ≃Ω e /2. This paper uses spacecraft observations and two-dimensional particle-in-cell simulations in a magnetized, homogeneous, collisionless plasma to test the hypothesis that banded chorus is due to local linear growth of two...

We perform the first statistical study of the effects of the interaction of suprathermal electrons with narrow-band whistler mode waves in the solar wind (SW). We show that this interaction does occur and that it is associated with enhanced widths of the so-called strahl component. The latter is directed along the interplanetary magnetic field away from the Sun. We do the study by comparing the...

The limitations of Hall MHD as a model for turbulence in weakly collisional plasmas are explored using quantitative comparisons to Vlasov-Maxwell kinetic theory over a wide range of parameter space. The validity of Hall MHD in the cold ion limit is shown, but spurious undamped wave modes exist in Hall MHD when the ion temperature is finite. It is argued that turbulence in the dissipation range ...

Whistler Text-to-Speech engine was designed so that we can automatically construct the model parameters from training data. This paper will describe in detail the design issues of constructing the synthesis unit inventory automatically from speech databases. The automatic process includes (1) determining the scaleable synthesis unit which can reflect spectral variations of different allophones;...

[1] We present observations of low-frequency waves (0.25 Hz < f < 10 Hz) at five quasi-perpendicular interplanetary (IP) shocks observed by the Wind spacecraft. Four of the five IP shocks had oblique precursor whistler waves propagating at angles with respect to the magnetic field of 20 –50 and large propagation angles with respect to the shock normal; thus they do not appear to be phase standi...

The solar wind serves as a laboratory for investigating magnetohydrodynamic turbulence under conditions irreproducible on the terra firma. Here we show that the frame work of Hall magnetohydrodynamics (HMHD), which can support three quadratic invariants and allows nonlinear states to depart fundamentally from the Alfvénic, is capable of reproducing in the inertial range the three branches of th...

Particle-in-Cell simulations and statistical analysis are carried out to study the dynamic evolution of a collisionless, magnetized plasma with co-existing whistler turbulence electron temperature anisotropy as initial condition, competing consequences cascade instability growth. The results show that operation within has almost no effects on fluctuating magnetic field energy intermittency gene...

Class of 2006 Interdisciplinary Studies in the Humanities At first glance, the night scenes in the Futurist paintings Streetlight: A Study in Light, by Giacomo Balla, and Forces of the Street, by Umberto Boccioni, seem to have little relation to James Whistler’s Nocturne: Grey and Gold. Yet although the Futurists created their night scenes some 30 years later than Whistler, when we consider the...

We demonstrate that signals at 28.5 kHz emitted from the Naval (NAU) transmitter in Puerto Rico e ectively couple into ionospheric ducts, induced/enhanced by the Arecibo HF heater, and propagate into the conjugate hemisphere as ducted whistlers. Also presented are suspected radar detections of whistler-triggered electron precipitation events. NAU-generated whistlers have intensities su cient to...

Heat-transfer through weakly magnetized diffuse astrophysical plasmas excites whistlers. This leads to electron whistler resonant scattering, a reduction of the electron mean-free path, and heat-flux inhibition. However, only whistlers propagating at a finite angle to the magnetic field (off-axis) can scatter the heat-flux carrying electrons. Thus, the level of heat flux-inhibition along the ma...