scholarly journals Poloidal Mode Wave-Particle Interactions Inferred From Van Allen Probes and CARISMA Ground-Based Observations

2018 ◽  
Vol 123 (6) ◽  
pp. 4652-4667 ◽  
Author(s):  
C. Wang ◽  
R. Rankin ◽  
Y. Wang ◽  
Q.-G. Zong ◽  
X. Zhou ◽  
...  
Keyword(s):  
Particle Interactions ◽  
Mode Wave ◽  
Van Allen Probes ◽  
Wave Particle Interactions

scholarly journals The Acceleration of Electrons to High Energies Over the Jovian Polar Cap via Whistler Mode Wave-Particle Interactions

2018 ◽  
Vol 123 (9) ◽  
pp. 7523-7533 ◽  
Author(s):  
S. S. Elliott ◽  
D. A. Gurnett ◽  
W. S. Kurth ◽  
B. H. Mauk ◽  
R. W. Ebert ◽  
...  
Keyword(s):  
Particle Interactions ◽  
Polar Cap ◽  
Whistler Mode ◽  
Mode Wave ◽  
High Energies ◽  
Whistler Mode Wave ◽  
Wave Particle Interactions

scholarly journals Van Allen Probes observations of direct wave-particle interactions

2014 ◽  
Vol 41 (6) ◽  
pp. 1869-1875 ◽  
Author(s):  
J. F. Fennell ◽  
J. L. Roeder ◽  
W. S. Kurth ◽  
M. G. Henderson ◽  
B. A. Larsen ◽  
...  
Keyword(s):  
Particle Interactions ◽  
Direct Wave ◽  
Van Allen Probes ◽  
Wave Particle Interactions

scholarly journals Wave–particle interaction effects in the Van Allen belts

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Daniel N. Baker
Keyword(s):  
Electromagnetic Waves ◽  
Radiation Belt ◽  
Particle Interaction ◽  
Outer Zone ◽  
High Energy ◽  
Particle Interactions ◽  
Magnetospheric Substorms ◽  
Chorus Waves ◽  
Van Allen Probes ◽  
Wave Particle Interactions

AbstractDiscovering such structures as the third radiation belt (or “storage ring”) has been a major observational achievement of the NASA Radiation Belt Storm Probes program (renamed the “Van Allen Probes” mission in November 2012). A goal of that program was to understand more thoroughly how high-energy electrons are accelerated deep inside the radiation belts—and ultimately lost—due to various wave–particle interactions. Van Allen Probes studies have demonstrated that electrons ranging up to 10 megaelectron volts (MeV) or more can be produced over broad regions of the outer Van Allen zone on timescales as short as a few minutes. The key to such rapid acceleration is the interaction of “seed” populations of ~ 10–200 keV electrons (and subsequently higher energies) with electromagnetic waves in the lower band (whistler-mode) chorus frequency range. Van Allen Probes data show that “source” electrons (in a typical energy range of one to a few tens of keV energy) produced by magnetospheric substorms play a crucial role in feeding free energy into the chorus waves in the outer zone. These chorus waves then, in turn, rapidly heat and accelerate the tens to hundreds of keV seed electrons injected by substorms to much higher energies. Hence, we often see that geomagnetic activity driven by strong solar storms (coronal mass ejections, or CMEs) commonly leads to ultra-relativistic electron production through the intermediary step of waves produced during intense magnetospheric substorms. More generally, wave–particle interactions are of fundamental importance over a broad range of energies and in virtually all regions of the magnetosphere. We provide a summary of many of the wave modes and particle interactions that have been studied in recent times.

Energetic electron precipitation via oblique whistler mode chorus emissions in the outer radiation belt

2021 ◽  
Author(s):  
Yikai Hsieh ◽  
Yoshiharu Omura
Keyword(s):  
Cyclotron Resonance ◽  
Energetic Electron ◽  
Particle Simulation ◽  
Electron Precipitation ◽  
Particle Interactions ◽  
Outer Radiation Belt ◽  
Whistler Mode ◽  
Mode Wave ◽  
Whistler Mode Wave ◽  
Wave Particle Interactions

<p>Whistler mode chorus emissions in the Earth’s magnetosphere cause energetic electron precipitation and the associated pulsating aurora. First-order cyclotron resonance in parallel whistler mode wave-particle interactions is the main mechanism of the precipitation. Not only cyclotron resonance but also Landau resonance and higher-order cyclotron resonances occur in the oblique whistler mode wave-particle interactions. Especially, electrons can be accelerated and scattered to lower equatorial pitch angles rapidly via Landau resonance. We apply test particle simulation and the Green’s function method to check the energetic electron precipitation caused by oblique chorus emissions. We simulate the wave-particle interactions around L=4.5 for electron ranges from 10 keV to a few MeV. We further compare the precipitation fluxes between parallel and oblique chorus emissions. Our simulation result reveals that oblique chorus emissions lead to more electron precipitation than parallel chorus emissions. At kinetic energy E < 100 keV, the electron precipitation ratio (oblique case/parallel case) is about 1.3. At 100 keV < E < 0.5 MeV, the ratio is greater than 2. At E > 0.5 MeV, the ratio is greater than 2 orders. Multiple resonances effect in the oblique whistler mode wave-particle interactions is the reason for the greater precipitation.</p>

Statistical EMIC diffusion models calculated by averaging observation specific diffusion coefficients

2021 ◽  
Author(s):  
Johnathan Ross ◽  
Sarah Glauert ◽  
Richard Horne ◽  
Nigel Meredith ◽  
Clare Watt
Keyword(s):  
Diffusion Coefficients ◽  
Radiation Belt ◽  
Diffusion Models ◽  
Relativistic Electrons ◽  
Particle Interactions ◽  
Resonant Wave ◽  
Van Allen Probes ◽  
Through Diffusion ◽  
Wave Particle Interactions ◽  
Emic Waves

<p>Electromagnetic ion cyclotron (EMIC) waves play an important role in relativistic electron losses in the radiation belts through diffusion via resonant wave-particle interactions. We present a new statistical model of electron diffusion by EMIC waves calculated, using Van Allen Probe observations, by averaging observation specific diffusion coefficients. The resulting diffusion coefficients therefore capture a wider range of wave-particle interactions than previous average models which are calculated using average observations. These calculations, and their role in radiation belt simulations, are then compared against existing diffusion models. The new diffusion coefficients are found to significantly improve the agreement between the calculated decay of relativistic electrons and Van Allen Probes data.</p><p> </p>

Resonance effects of wave-particle interactions during artificial charges particle beam injections in ionospheric plasma

2014 ◽  
Vol 20 (5(90)) ◽  
pp. 3-26 ◽  
Author(s):  
N. Baranets ◽  
◽  
Yu. Ruzhin ◽  
N. Erokhin ◽  
V. Afonin ◽  
...  
Keyword(s):  
Ionospheric Plasma ◽  
Particle Beam ◽  
Particle Interactions ◽  
Resonance Effects ◽  
Wave Particle Interactions
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