scholarly journals A unified theory of resonant excitation of kinetic ballooning modes by energetic ions/alpha particles in tokamaks

1991 ◽  
Author(s):  
H. Biglari ◽  
L. Chen
Keyword(s):  
Alpha Particles ◽  
Resonant Excitation ◽  
Unified Theory ◽  
Energetic Ions

Resonant excitation of shear Alfvén perturbations by trapped energetic ions in a tokamak

2009 ◽  
Vol 16 (10) ◽  
pp. 102506 ◽  
Author(s):  
I. G. Abel ◽  
B. N. Breizman ◽  
S. E. Sharapov ◽  
Keyword(s):  
Resonant Excitation ◽  
Energetic Ions

scholarly journals Helium in the Earth's foreshock: a global Vlasiator survey

2020 ◽  
Author(s):  
Markus Battarbee ◽  
Xóchitl Blanco-Cano ◽  
Lucile Turc ◽  
Primoz Kajdic ◽  
Vertti Tarvus ◽  
...  
Keyword(s):  
Low Frequency ◽  
Alpha Particles ◽  
Compressive Wave ◽  
Energetic Ions ◽  
Ion Distributions ◽  
Hot Plasma ◽  
Earth’S Bow Shock ◽  
Composition Analyzer ◽  
Ion Profiles ◽  
Low Frequency Waves

<p>The foreshock is a region of space in front of the Earth's bow shock, extending along the interplanetary magnetic field. It is permeated by ions and electrons reflected at the shock, low-frequency waves, and various plasma transients. The ion foreshock is dominated by a number of proton populations such as field-aligned beams, gyrating distributions and diffuse ions, as well as proton-excited waves. As the solar wind can contain a significant fraction of helium, it is of great interest to investigate how alpha-particles (He<sup>2+</sup>) are reflected into forming their own foreshock. We investigate the extent of the helium foreshock in relation to foreshock ultra-low frequency waves and protons using Vlasiator, a global hybrid-Vlasov simulation. We confirm a number of historical spacecraft observations at the foreshock regions associated with field-aligned beams, gyrating ion distributions, and specularly reflected particles, performing the first numerical global survey of the helium foreshock. We present wavelet analysis at multiple positions within the foreshock and evaluate the dynamics of gyrating ion populations in response to the transverse and compressive wave components. We also present Magnetosphere Multiscale (MMS) spacecraft crossings of the foreshock edge and compare Hot Plasma Composition Analyzer (HPCA) measurements of energetic ions with our simulation data, showing the variability of the foreshock edge suprathermal ion profiles.</p>

Unified theory of Mercier-ballooning and Alfvén eigenmodes in positive-shear tokamaks with large-orbit energetic ions

2005 ◽  
Vol 12 (4) ◽  
pp. 042507 ◽  
Author(s):  
A. B. Mikhailovskii ◽  
E. A. Kovalishen ◽  
V. S. Tsypin ◽  
R. M. O. Galvão
Keyword(s):  
Unified Theory ◽  
Energetic Ions ◽  
Alfven Eigenmodes

A Unified Theory of Voting

1999 ◽  
Author(s):  
Samuel Merrill, III ◽  
Bernard Grofman
Keyword(s):  
Unified Theory

A Unified Theory of Party Competition

2005 ◽  
Author(s):  
James F. Adams ◽  
Samuel Merrill III ◽  
Bernard Grofman
Keyword(s):  
Party Competition ◽  
Unified Theory
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