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

Global Morphology of Lower-band Chorus Wave Intensity Reconstructed Using multi-year POES Electron Measurements

2020 ◽  
Author(s):  
Yang Zhang ◽  
Binbin Ni ◽  
Xudong Gu ◽  
Yuri Shprits ◽  
Song Fu ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Wave Intensity ◽  
Global Distribution ◽  
Loss Cone ◽  
Wave Measurements ◽  
Lower Band ◽  
Chorus Waves ◽  
Radiation Belt Electrons ◽  
Chorus Wave

<p><span>Magnetospheric chorus is known to play a significant role in the acceleration and loss of radiation belt electrons. Interactions of chorus waves with radiation belt particles are commonly evaluated using quasi-linear diffusion codes that rely on statistical models, which might not accurately provide the instantaneous global wave distribution from limited in-situ wave measurements. Thus, a novel technique capable of inferring wave amplitudes from POES particle measurements, with an extensive coverage of L-shell and magnetic local time, has been established to obtain event-specific, global dynamic evolutions of chorus waves. This study, using 5 years of POES electron data, further improves the technique, and enables us to subsequently infer the chorus wave amplitudes for all useful data points (removing the electrons which were in the drift loss cone) and to construct the global distribution of lower-band chorus wave intensity. The results obtained from the improved technique reproduce Van Allen Probes in-situ observations of chorus waves reasonably well and reconstruct the major features of the global distribution of chorus waves. We demonstrate that such a data-based, dynamic model can provide near-real-time estimates of chorus wave intensity on a global scale for any time period when POES data are available, which cannot be obtained from in-situ wave measurements by equatorial satellites alone, but is crucial for quantifying the  dynamics of the radiation belt electrons.</span></p>

scholarly journals A novel technique to construct the global distribution of whistler mode chorus wave intensity using low-altitude POES electron data

2014 ◽  
Vol 119 (7) ◽  
pp. 5685-5699 ◽  
Author(s):  
Binbin Ni ◽  
Wen Li ◽  
Richard M. Thorne ◽  
Jacob Bortnik ◽  
Janet C. Green ◽  
...  
Keyword(s):  
Wave Intensity ◽  
Global Distribution ◽  
Whistler Mode ◽  
Novel Technique ◽  
Low Altitude ◽  
Chorus Wave

scholarly journals A prediction model for the global distribution of whistler chorus wave amplitude developed separately for two latitudinal zones

2015 ◽  
Vol 120 (4) ◽  
pp. 2819-2837 ◽  
Author(s):  
Jin-Hee Kim ◽  
Dae-Young Lee ◽  
Jung-Hee Cho ◽  
Dae-Kyu Shin ◽  
Kyung-Chan Kim ◽  
...  
Keyword(s):  
Prediction Model ◽  
Wave Amplitude ◽  
Global Distribution ◽  
Chorus Wave

Global Distribution of Reversed Energy Spectra of Ring Current Protons Based on Van Allen Probes Observations

2021 ◽  
Vol 48 (4) ◽  
Author(s):  
Juan Yi ◽  
Song Fu ◽  
Binbin Ni ◽  
Xudong Gu ◽  
Man Hua ◽  
...  
Keyword(s):  
Ring Current ◽  
Global Distribution ◽  
Energy Spectra ◽  
Van Allen Probes

scholarly journals An empirical model of the global distribution of plasmaspheric hiss based on Van Allen Probes EMFISIS measurements

2020 ◽  
Vol 4 (3) ◽  
pp. 1-20
Author(s):  
JingZhi Wang ◽  
◽  
Qi Zhu ◽  
XuDong Gu ◽  
Song Fu ◽  
...  
Keyword(s):  
Empirical Model ◽  
Global Distribution ◽  
Van Allen Probes

scholarly journals Attenuation of Plasmaspheric Hiss Associated with the Enhanced Magnetospheric Electric Field

2021 ◽  
Author(s):  
Haimeng Li ◽  
Wen Li ◽  
Qianli Ma ◽  
Yukitoshi Nishimura ◽  
Zhigang Yuan ◽  
...  
Keyword(s):  
Solar Wind ◽  
Electric Field ◽  
Energetic Electron ◽  
Wave Intensity ◽  
Wave Amplification ◽  
Model Driven ◽  
Van Allen Probes ◽  
Electron Distributions ◽  
New Finding ◽  
Substorm Activity

Abstract. We report an attenuation of hiss wave intensity in the duskside of outer plasmasphere in response to enhanced convection and substorm based on Van Allen Probes observations. Using test particle codes, we simulate the dynamics of energetic electron fluxes based on a realistic magnetospheric electric field model driven by solar wind and subauroral polarization stream. We suggest that the enhanced magnetospheric electric field causes the outward and sunward motion of energetic electrons, corresponding to the decrease of energetic electron fluxes on the duskside, leading to the subsequent attenuation of hiss wave intensity. The results indicate that the enhanced electric field can significantly change the energetic electron distributions, which provide free energy for hiss wave amplification. This new finding is critical for understanding the generation of plasmaspheric hiss and its response to solar wind and substorm activity.

scholarly journals A statistical analysis of the global distribution of plasmaspheric hiss based on Van Allen Probes wave observations

2017 ◽  
Vol 66 (3) ◽  
pp. 039401
Author(s):  
Xiang Zheng ◽  
Tan Jia-Qiang ◽  
Ni Bin-Bin ◽  
Gu Xu-Dong ◽  
Cao Xing ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Global Distribution ◽  
Van Allen Probes

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
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