Energetic particle trapping by Alfven wave instabilities

1979 ◽  
Author(s):  
Ellen G. Zweibel
Keyword(s):  
Energetic Particle ◽  
Alfven Wave ◽  
Particle Trapping ◽  
Wave Instabilities

Observations of Broadband Shear Alfvén-Wave Instabilities

1981 ◽  
Vol 47 (3) ◽  
pp. 183-186 ◽  
Author(s):  
R. Hatakeyama ◽  
M. Inutake ◽  
T. Akitsu
Keyword(s):  
Alfven Wave ◽  
Wave Instabilities

Understanding the Origin of Variable Compositions of Gradual Solar Energetic Particle Events by Combining Observations and Numerical Simulations

2020 ◽  
Author(s):  
Nariaki Nitta ◽  
Meng Jin ◽  
Christina Cohen
Keyword(s):  
Energetic Particle ◽  
Remote Sensing Data ◽  
Solar Energetic Particle ◽  
Alfven Wave ◽  
Modeling Framework ◽  
Shock Surface ◽  
High Energies ◽  
Weather Modeling ◽  
Compositional Variability ◽  
Multiple Spacecraft

<p>One of the mysteries of solar energetic particle (SEP) events is the compositional variability in those events that are clearly shock-related and may be called gradual events.<span>  </span>In particular, the reason for the enhancement of Fe with respect to O or C at high energies has been debated over the past two decades, and yet it is still unsettled.<span>  </span>One hypothesis relates the compositional variability with whether the CME-driven shock is quasi-parallel or quad-perpendicular near the Sun, bu<span>t this may not be easily tested using</span> remote-sensing data alone. In recent years, however, CME-driven shock waves have been modelled by fitting shock-like features in EUV and white-light images with relatively simple shapes, and in combination with magnetic field models, ir is possible to compute shock parameters at the shock surface. In this presentation, we simulate a few CMEs whose associated SEP events show widely different Fe/O, using the Alfven wave Solar Model (AWSoM) that is part of the Space Weather Modeling Framework (SWMF). We constrain the input parameters of the simulations so that the observed pre-eruption corona, erup<span>tion and CME are well-reproduced. The shock surface, across which the shock parameters are highly non-uniform, is carefully traced, and the time-dependent connectivity of the shock surface with the observer at multiple spacecraft is compared with the SEP properties including composition. We discuss how much about the compositional variability of SEP events can be learned with this technique.</span></p>

scholarly journals Landau-fluid simulations of Alfvén-wave instabilities in a warm collisionless plasma

2004 ◽  
Vol 11 (5/6) ◽  
pp. 609-618 ◽  
Author(s):  
G. Bugnon ◽  
T. Passot ◽  
P. L. Sulem
Keyword(s):  
Coherent Structures ◽  
Fluid Model ◽  
Collisionless Plasma ◽  
Alfven Wave ◽  
Circularly Polarized ◽  
Inverse Cascade ◽  
Particle Heating ◽  
Wave Instabilities ◽  
Modulational Instabilities ◽  
General Conditions

Abstract. A dispersive Landau-fluid model is used to study the decay and modulational instabilities of circularly-polarized Alfvén waves in a collisionless plasma, as well as their nonlinear developments. Comparisons are presented with the drift-kinetic approximation for the dispersionless regime and with hybrid simulations in more general conditions. The effect of the nature of the instability on particle heating is discussed, together with the formation of coherent structures or the development of an inverse cascade.

MULTI-FRACTALS OF STRANGE ATTRACTORS IN PARALLEL-PUMPED SPIN-WAVE INSTABILITIES

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1599-C8-1600
Author(s):  
K. Nakamura ◽  
M. Mino ◽  
H. Yamazaki
Keyword(s):  
Spin Wave ◽  
Strange Attractors ◽  
Wave Instabilities
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