scholarly journals Quasiperiodic Whistler Mode Emissions Observed by the Van Allen Probes Spacecraft

2018 ◽  
Vol 123 (11) ◽  
pp. 8969-8982 ◽  
Author(s):  
F. Němec ◽  
G. B. Hospodarsky ◽  
B. Bezděková ◽  
A. G. Demekhov ◽  
D. L. Pasmanik ◽  
...  
Keyword(s):  
Whistler Mode ◽  
Van Allen Probes

scholarly journals Van Allen Probes observations of unusually low frequency whistler mode waves observed in association with moderate magnetic storms: Statistical study

2015 ◽  
Vol 42 (18) ◽  
pp. 7273-7281 ◽  
Author(s):  
C. A. Cattell ◽  
A. W. Breneman ◽  
S. A. Thaller ◽  
J. R. Wygant ◽  
C. A. Kletzing ◽  
...  
Keyword(s):  
Statistical Study ◽  
Low Frequency ◽  
Magnetic Storms ◽  
Whistler Mode ◽  
Van Allen Probes ◽  
Whistler Mode Waves

scholarly journals Early-Time Non-Equilibrium Pitch Angle Diffusion of Electrons by Whistler-Mode Hiss in a Plasmaspheric Plume Associated with BARREL Precipitation

2021 ◽  
Vol 8 ◽  
Author(s):  
R. M. Millan ◽  
J.-F. Ripoll ◽  
O. Santolík ◽  
W. S. Kurth
Keyword(s):  
Phase Space ◽  
Pitch Angle ◽  
Particle Interaction ◽  
Phase Space Density ◽  
Angle Distribution ◽  
Loss Cone ◽  
Linear Diffusion ◽  
Whistler Mode ◽  
Space Density ◽  
Van Allen Probes

In August 2015, the Balloon Array for Radiation belt Relativistic Electron Losses (BARREL) observed precipitation of energetic (<200 keV) electrons magnetically conjugate to a region of dense cold plasma as measured by the twin Van Allen Probes spacecraft. The two spacecraft passed through the high density region during multiple orbits, showing that the structure was spatial and relatively stable over many hours. The region, identified as a plasmaspheric plume, was filled with intense hiss-like plasma waves. We use a quasi-linear diffusion model to investigate plume whistler-mode hiss waves as the cause of precipitation observed by BARREL. The model input parameters are based on the observed wave, plasma and energetic particle properties obtained from Van Allen Probes. Diffusion coefficients are found to be largest in the same energy range as the precipitation observed by BARREL, indicating that the plume hiss waves were responsible for the precipitation. The event-driven pitch angle diffusion simulation is also used to investigate the evolution of the electron phase space density (PSD) for different energies and assumed initial pitch angle distributions. The results show a complex temporal evolution of the phase space density, with periods of both growth and loss. The earliest dynamics, within the ∼5 first minutes, can be controlled by a growth of the PSD near the loss cone (by a factor up to ∼2, depending on the conditions, pitch angle, and energy), favored by the absence of a gradient at the loss cone and by the gradients of the initial pitch angle distribution. Global loss by 1-3 orders of magnitude (depending on the energy) occurs within the first ∼100 min of wave-particle interaction. The prevalence of plasmaspheric plumes and detached plasma regions suggests whistler-mode hiss waves could be an important driver of electron loss even at high L-value (L ∼6), outside of the main plasmasphere.

scholarly journals Van Allen Probes observations of whistler-mode chorus with long-lived oscillating tones

2017 ◽  
Vol 44 (12) ◽  
pp. 5909-5919 ◽  
Author(s):  
Zhonglei Gao ◽  
Zhenpeng Su ◽  
Lunjin Chen ◽  
Huinan Zheng ◽  
Yuming Wang ◽  
...  
Keyword(s):  
Whistler Mode ◽  
Van Allen Probes

scholarly journals Observations Directly Linking Relativistic Electron Microbursts to Whistler Mode Chorus: Van Allen Probes and FIREBIRD II

2017 ◽  
Vol 44 (22) ◽  
pp. 11,265-11,272 ◽  
Author(s):  
A. W. Breneman ◽  
A. Crew ◽  
J. Sample ◽  
D. Klumpar ◽  
A. Johnson ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Whistler Mode ◽  
Van Allen Probes

scholarly journals Whistler Mode Quasiperiodic Emissions: Contrasting Van Allen Probes and DEMETER Occurrence Rates

2020 ◽  
Vol 125 (4) ◽  
Author(s):  
F. Němec ◽  
O. Santolík ◽  
G. B. Hospodarsky ◽  
M. Hajoš ◽  
A. G. Demekhov ◽  
...  
Keyword(s):  
Whistler Mode ◽  
Van Allen Probes

scholarly journals Correlated Pc4-5 ULF waves, whistler-mode chorus, and pulsating aurora observed by the Van Allen Probes and ground-based systems

2015 ◽  
Vol 120 (10) ◽  
pp. 8749-8761 ◽  
Author(s):  
A. N. Jaynes ◽  
M. R. Lessard ◽  
K. Takahashi ◽  
A. F. Ali ◽  
D. M. Malaspina ◽  
...  
Keyword(s):  
Ulf Waves ◽  
Whistler Mode ◽  
Van Allen Probes
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