scholarly journals Van Allen Probes Observations of Chorus Wave Vector Orientations: Implications for the Chorus‐to‐Hiss Mechanism

2019 ◽  
Vol 46 (5) ◽  
pp. 2337-2346 ◽  
Author(s):  
D. P. Hartley ◽  
C. A. Kletzing ◽  
L. Chen ◽  
R. B. Horne ◽  
O. Santolík
Keyword(s):  
Wave Vector ◽  
Van Allen Probes ◽  
Chorus Wave

The Angular Distribution of Whistler-Mode Chorus and the Importance of Plumes in the Chorus-Hiss Mechanism

2020 ◽  
Author(s):  
David P. Hartley ◽  
Lunjin Chen ◽  
Craig Kletzing ◽  
Richard Horne ◽  
Ondrej Santolik
Keyword(s):  
Ray Tracing ◽  
Wave Vector ◽  
Initial Conditions ◽  
Large Fraction ◽  
Wave Power ◽  
Statistical Distributions ◽  
Chorus Waves ◽  
Van Allen Probes ◽  
Vector Orientation ◽  
Chorus Wave

<p>Correlations between chorus waves and plasmaspheric hiss have been directly observed, leading to the proposition that the two wave modes are causally linked. Ray tracing simulations have confirmed that chorus waves can propagate into the plasmasphere and be a source of plasmaspheric hiss, but only for a specific set of initial conditions, particularly relating to the orientation of the wave vector at the chorus source. In this study, both survey and burst mode observations from the Van Allen Probes EMFISIS Waves instrument are coupled with ray tracing simulations to determine the fraction of chorus wave power that exists with the conditions required to enter the plasmasphere. In general, it is found that only a small fraction (< 2%) of chorus wave power exists with the required wave vector orientation. An exception is found when the chorus source is located close to a plasmaspheric plume. Here, azimuthal density gradients modify the wave propagation to permit a large fraction, up to 94%, of chorus wave power to access the plasmasphere. Therefore plasmaspheric plumes are identified as an important access region if a significant fraction of chorus wave power is to enter the plasmasphere and be a source of plasmaspheric hiss. To provide context, we note that plumes are most commonly observed on the dusk side whereas chorus wave power typically peak on the dawn side. The post-noon sector, where these two statistical distributions overlap, appears to be key for observing correlations between chorus and hiss. As such, particular attention is devoted to this region.</p>

scholarly journals New chorus wave properties near the equator from Van Allen Probes wave observations

2016 ◽  
Vol 43 (10) ◽  
pp. 4725-4735 ◽  
Author(s):  
W. Li ◽  
O. Santolik ◽  
J. Bortnik ◽  
R. M. Thorne ◽  
C. A. Kletzing ◽  
...  
Keyword(s):  
Van Allen Probes ◽  
Wave Properties ◽  
Chorus Wave

Determining the global coherence of chorus waves in the magnetosphere

2021 ◽  
Author(s):  
Shuai Zhang ◽  
Jonathan Rae ◽  
Clare Watt ◽  
Alexander Degeling ◽  
Anmin Tian ◽  
...  
Keyword(s):  
Growth Parameters ◽  
Time Lag ◽  
Spatial Coherence ◽  
Temporal Coherence ◽  
Geomagnetic Index ◽  
Outer Radiation Belt ◽  
Chorus Waves ◽  
Van Allen Probes ◽  
Temporal And Spatial ◽  
Chorus Wave

<p>Whistler mode chorus waves play a vital role in the Earth’s outer radiation belt dynamics through the cyclotron resonant pitch angle diffusion.     Recent numerical studies have shown that the temporal and spatial variability of wave growth parameters have universal importance for the diffusion process, which should be much larger than those in the traditional averaged diffusion model.       In the present study, we analyzed both the temporal and spatial coherence of chorus wave in a statistical method using data from the EMFISIS instrument onboard the Van Allen Probes A&B from November 2012 to July 2019. In total, we find 3,875 chorus wave events to calculate the correlation of wave amplitudes between Van Allen Probes A&B.      The results show that both the spatial and temporal correlation of chorus waves decrease significantly with increasing spacecraft separation and time lag, and the spatial and temporal coherence of chorus wave only last ~433 km and ~12 s. We also find that the spatial coherence of chorus waves is higher at L>6, on the dayside, or with a lower geomagnetic index (AL*), while the temporal coherence of chorus waves does not depend on the L-shell, geomagnetic index (AL*) or magnetic local time (MLT). Our results will increase the accuracy of modeling wave-particle interactions due to chorus waves.</p>

scholarly journals Event-specific chorus wave and electron seed population models in DREAM3D using the Van Allen Probes

2014 ◽  
Vol 41 (5) ◽  
pp. 1359-1366 ◽  
Author(s):  
Weichao Tu ◽  
G. S. Cunningham ◽  
Y. Chen ◽  
S. K. Morley ◽  
G. D. Reeves ◽  
...  
Keyword(s):  
Population Models ◽  
Seed Population ◽  
Van Allen Probes ◽  
Chorus Wave

scholarly journals Synthetic Empirical Chorus Wave Model From Combined Van Allen Probes and Cluster Statistics

2018 ◽  
Vol 123 (1) ◽  
pp. 297-314 ◽  
Author(s):  
O. V. Agapitov ◽  
D. Mourenas ◽  
A. V. Artemyev ◽  
F. S. Mozer ◽  
G. Hospodarsky ◽  
...  
Keyword(s):  
Wave Model ◽  
Van Allen Probes ◽  
Chorus Wave

scholarly journals Constructing the global distribution of chorus wave intensity using measurements of electrons by the POES satellites and waves by the Van Allen Probes

2013 ◽  
Vol 40 (17) ◽  
pp. 4526-4532 ◽  
Author(s):  
W. Li ◽  
B. Ni ◽  
R. M. Thorne ◽  
J. Bortnik ◽  
J. C. Green ◽  
...  
Keyword(s):  
Wave Intensity ◽  
Global Distribution ◽  
Van Allen Probes ◽  
Chorus Wave

Effects of Higher-Order Laue Zone reflections on structure images

1993 ◽  
Vol 51 ◽  
pp. 450-451
Author(s):  
H. S. Kim ◽  
S. S. Sheinin
Keyword(s):  
Wave Vector ◽  
Theoretical Calculations ◽  
Reciprocal Lattice ◽  
Image Plane ◽  
Bloch Wave ◽  
Dynamical Theory ◽  
Higher Order ◽  
Lattice Image ◽  
Lattice Vector ◽  
Image Position

The importance of image simulation in interpreting experimental lattice images is well established. Normally, in carrying out the required theoretical calculations, only zero order Laue zone reflections are taken into account. In this paper we assess the conditions for which this procedure is valid and indicate circumstances in which higher order Laue zone reflections may be important. Our work is based on an analysis of the requirements for obtaining structure images i.e. images directly related to the projected potential. In the considerations to follow, the Bloch wave formulation of the dynamical theory has been used.The intensity in a lattice image can be obtained from the total wave function at the image plane is given by: where ϕg(z) is the diffracted beam amplitide given by In these equations,the z direction is perpendicular to the entrance surface, g is a reciprocal lattice vector, the Cg(i) are Fourier coefficients in the expression for a Bloch wave, b(i), X(i) is the Bloch wave excitation coefficient, ϒ(i)=k(i)-K, k(i) is a Bloch wave vector, K is the electron wave vector after correction for the mean inner potential of the crystal, T(q) and D(q) are the transfer function and damping function respectively, q is a scattering vector and the summation is over i=l,N where N is the number of beams taken into account.

Wave-Vector-Varying Pancharatnam-Berry Phase Photonic Spin Hall Effect

2021 ◽  
Vol 126 (8) ◽  
Author(s):  
Wenguo Zhu ◽  
Huadan Zheng ◽  
Yongchun Zhong ◽  
Jianhui Yu ◽  
Zhe Chen
Keyword(s):  
Hall Effect ◽  
Wave Vector ◽  
Berry Phase ◽  
Spin Hall Effect
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