scholarly journals Richard Mansergh Thorne (1942–2019)

Eos ◽  
2019 ◽  
Vol 100 ◽  
Author(s):  
Richard Horne ◽  
Bruce Tsurutani
Keyword(s):  
Space Plasma ◽  
Radiation Belts ◽  
Particle Interactions ◽  
Low Level ◽  
Complex Wave ◽  
Wave Particle Interactions ◽  
The Way ◽  
Earth's Radiation Belts

A pioneering space plasma physicist who led the way in understanding how complex wave-particle interactions control Earth’s radiation belts and low-level auroral light emissions.

Quasi-linear wave-particle interactions in the Earth’s radiation belts

1989 ◽  
Vol 94 (A11) ◽  
pp. 15243 ◽  
Author(s):  
Elena Villalón ◽  
William J. Burke ◽  
Paul L. Rothwell ◽  
Michael B. Silevitch
Keyword(s):  
Radiation Belts ◽  
Linear Wave ◽  
Particle Interactions ◽  
Wave Particle Interactions ◽  
Earth's Radiation Belts

scholarly journals The implications of temporal variability in wave‐particle interactions in Earth's Radiation Belts

2020 ◽  
Author(s):  
C. E. J. Watt ◽  
H. J. Allison ◽  
R. L. Thompson ◽  
S. N. Bentley ◽  
N. P. Meredith ◽  
...  
Keyword(s):  
Temporal Variability ◽  
Radiation Belts ◽  
Particle Interactions ◽  
Wave Particle Interactions ◽  
Earth's Radiation Belts

scholarly journals On the altitude dependence of transversely heated O<sup>+</sup> distributions in the cusp/cleft

2004 ◽  
Vol 22 (5) ◽  
pp. 1787-1798 ◽  
Author(s):  
M. Bouhram ◽  
B. Klecker ◽  
W. Miyake ◽  
H. Rème ◽  
J.-A. Sauvaud ◽  
...  
Keyword(s):  
Space Plasma ◽  
Particle Interactions ◽  
Space Plasma Physics ◽  
Ion Outflow ◽  
Oxygen Ion ◽  
Altitude Dependence ◽  
Statistical Studies ◽  
Wave Particle Interactions ◽  
Auroral Phenomena ◽  
First Time

Abstract. The present paper focuses on the altitude dependence of oxygen ion conics in the dayside cusp/cleft region. Here, combining oxygen data from the Akebono, Interball-2 and Cluster satellites allows, for the first time, one to follow the global development of energetic (up to ~10keV) ion outflow over a continuous and broad altitude range up to about 5.5 Earth radii (RE). According to earlier statistical studies, the results are consistent with a height-integrated energization of ions at altitudes up to 3.5 RE. Higher up, the results inferred from Cluster observations put forward evidence of a saturation of both a transverse energization rate and ion gyroradii. We suggest that such results may be interpreted as finite perpendicular wavelength effects (a few tens of km) in the wave-particle interactions. To substantiate the suggestion, we carry out two-dimensional, Monte Carlo simulations of ion conic production that incorporate such effects and limited residence times due to the finite latitudinal extent of the heating region.Key words. Magnetospheric physics (auroral phenomena) – Space plasma physics (charged particle motion and acceleration; wave-particle interactions)

Effect of finite correlation time on the wave-particle interactions of nonlinear electrostatic structures with electrons in the Earth's radiation belts.

2020 ◽  
Author(s):  
Adnane Osmane
Keyword(s):  
Phase Space ◽  
Pitch Angle ◽  
Radiation Belts ◽  
Particle Interactions ◽  
Chorus Waves ◽  
Angle Scattering ◽  
Open Question ◽  
Finite Correlation ◽  
Earth's Radiation Belts

&lt;p&gt;&lt;em&gt;In situ&lt;/em&gt; measurements of electron scale fluctuations by the Van Allen Probes and MMS have demonstrated the ubiquitous occurrence of phase-space holes and various kinetic nonlinear structures in the Earth's magnetosphere. However it remains an open question whether phase-space holes have to be incorporated into global magnetospheric models describing the energisation and acceleration of electrons. In this communication we will review current wave-particle models of electron phase-space holes interacting with energetic electrons (e.g. &gt;1 keV in the Earth's radiation belts)&amp;#160; and present new theoretical results showing that finite correlation times of phase-space holes results in enhanced pitch-angle scattering. The pitch-angle scattering by phase-space holes is shown to be on par with that produced by chorus waves, and in some instances outgrows the chorus contribution.&amp;#160;&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;

scholarly journals Wave-particle interactions in the outer radiation belts

2015 ◽  
Vol 5 (2) ◽  
pp. 68-74 ◽  
Author(s):  
O. Agapitov ◽  
◽  
F. Mozer ◽  
A. Artemyev ◽  
D. Mourenas ◽  
...  
Keyword(s):  
Radiation Belts ◽  
Particle Interactions ◽  
Wave Particle Interactions

scholarly journals Effect of plasma density on diffusion rates due to wave particle interactions with chorus and plasmaspheric hiss: extreme event analysis

2014 ◽  
Vol 32 (8) ◽  
pp. 1059-1071 ◽  
Author(s):  
A. Sicard-Piet ◽  
D. Boscher ◽  
R. B. Horne ◽  
N. P. Meredith ◽  
V. Maget
Keyword(s):  
Electron Density ◽  
Plasma Density ◽  
Radiation Belts ◽  
Cumulative Distribution ◽  
Cumulative Probability ◽  
Particle Interactions ◽  
Energy Diffusion ◽  
Chorus Waves ◽  
Diffusion Rates ◽  
Wave Particle Interactions

Abstract. Wave particle interactions play an important role in controlling the dynamics of the radiation belts. The purpose of this study is to estimate how variations in the plasma density can affect diffusion rates resulting from interactions between chorus waves and plasmaspheric hiss with energetic particles and the resulting evolution of the energetic electron population. We perform a statistical analysis of the electron density derived from the plasma wave experiment on the CRRES satellite for two magnetic local time sectors corresponding to near midnight and near noon. We present the cumulative probability distribution of the electron plasma density for three levels of magnetic activity as measured by Kp. The largest densities are seen near L* = 2.5 while the smallest occur near L* = 6. The broadest distribution, corresponding to the greatest variability, occurs near L* = 4. We calculate diffusion coefficients for plasmaspheric hiss and whistler mode chorus for extreme values of the electron density and estimate the effects on the radiation belts using the Salammbô model. At L* = 4 and L* = 6, in the low density case, using the density from the 5th percentile of the cumulative distribution function, electron energy diffusion by chorus waves is strongest at 2 MeV and increases the flux by up to 3 orders of magnitude over a period of 24 h. In contrast, in the high density case, using the density from the 95th percentile, there is little acceleration at energies above 800 keV at L* = 6, and virtually no acceleration at L* = 4. In this case the strongest energy diffusion occurs at lower energies around 400 keV where the flux at L* = 6 increases 3 orders of magnitude.

scholarly journals Spectral characteristics of waves and particles in the model of cyclotron wave-particle interactions near plasmapause

1999 ◽  
Vol 17 (3) ◽  
pp. 351-357 ◽  
Author(s):  
D. l. Pasmanik ◽  
V. Y. Trakhtengerts
Keyword(s):  
Spectral Characteristics ◽  
Wave Spectrum ◽  
Energetic Electron ◽  
Space Plasma ◽  
Quantitative Model ◽  
Energetic Particles ◽  
Particle Interactions ◽  
Space Plasma Physics ◽  
Evening Sector ◽  
Wave Particle Interactions

Abstract. Further analysis of energetic electron precipitation at the evening sector of magnetosphere is performed. In the framework of the quantitative model of cyclotron wave-particle interactions developed in the previous Pasmanik et al. paper, the case of finite spread over energies of initial energetic electron distribution is studied. The solution for distribution function of energetic electron is found. The energetic spectrum of trapped and precipitating electrons and whistler wave spectrum are analysed.Key words. Magnetospheric physics (energetic particles · precipitating; energetic particles · trapped); · Space plasma physics (wave-particle interactions).

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