On nonlinear evolution of low-frequency Alfvén waves in weakly-expanding solar wind plasmas

2015 ◽  
Vol 22 (2) ◽  
pp. 022309 ◽  
Author(s):  
Y. Nariyuki
Keyword(s):  
Solar Wind ◽  
Nonlinear Evolution ◽  
Low Frequency ◽  
Alfven Waves ◽  
Alfvén Waves

Nonlinear evolution of dispersive Alfvén waves and the effect of magnetic islands in the solar wind plasmas

2020 ◽  
Vol 27 (7) ◽  
pp. 072903
Author(s):  
Swati Sharma ◽  
R. P. Sharma ◽  
M. K. Mishra ◽  
R. Uma
Keyword(s):  
Solar Wind ◽  
Nonlinear Evolution ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Magnetic Islands

scholarly journals Parametric instability, inverse cascade and the  range of solar-wind turbulence

2018 ◽  
Vol 84 (1) ◽  
Author(s):  
Benjamin D. G. Chandran
Keyword(s):  
Solar Wind ◽  
Nonlinear Evolution ◽  
Parametric Instability ◽  
Alfven Waves ◽  
Turbulence Theory ◽  
Alfven Wave ◽  
Alfvén Waves ◽  
Fast Solar Wind ◽  
Parametric Decay ◽  
Inverse Cascade

In this paper, weak-turbulence theory is used to investigate the nonlinear evolution of the parametric instability in three-dimensional low-$\unicode[STIX]{x1D6FD}$ plasmas at wavelengths much greater than the ion inertial length under the assumption that slow magnetosonic waves are strongly damped. It is shown analytically that the parametric instability leads to an inverse cascade of Alfvén wave quanta, and several exact solutions to the wave kinetic equations are presented. The main results of the paper concern the parametric decay of Alfvén waves that initially satisfy $e^{+}\gg e^{-}$, where $e^{+}$ and $e^{-}$ are the frequency ($f$) spectra of Alfvén waves propagating in opposite directions along the magnetic field lines. If $e^{+}$ initially has a peak frequency $f_{0}$ (at which $fe^{+}$ is maximized) and an ‘infrared’ scaling $f^{p}$ at smaller $f$ with $-1<p<1$, then $e^{+}$ acquires an $f^{-1}$ scaling throughout a range of frequencies that spreads out in both directions from $f_{0}$. At the same time, $e^{-}$ acquires an $f^{-2}$ scaling within this same frequency range. If the plasma parameters and infrared $e^{+}$ spectrum are chosen to match conditions in the fast solar wind at a heliocentric distance of 0.3 astronomical units (AU), then the nonlinear evolution of the parametric instability leads to an $e^{+}$ spectrum that matches fast-wind measurements from the Helios spacecraft at 0.3 AU, including the observed $f^{-1}$ scaling at $f\gtrsim 3\times 10^{-4}~\text{Hz}$. The results of this paper suggest that the $f^{-1}$ spectrum seen by Helios in the fast solar wind at $f\gtrsim 3\times 10^{-4}~\text{Hz}$ is produced in situ by parametric decay and that the $f^{-1}$ range of $e^{+}$ extends over an increasingly narrow range of frequencies as $r$ decreases below 0.3 AU. This prediction will be tested by measurements from the Parker Solar Probe.

scholarly journals TURBULENCE IN THE SUB-ALFVÉNIC SOLAR WIND DRIVEN BY REFLECTION OF LOW-FREQUENCY ALFVÉN WAVES

2009 ◽  
Vol 700 (1) ◽  
pp. L39-L42 ◽  
Author(s):  
A. Verdini ◽  
M. Velli ◽  
E. Buchlin
Keyword(s):  
Solar Wind ◽  
Low Frequency ◽  
Alfven Waves ◽  
Alfvén Waves

scholarly journals On the origin of solar wind. Alfvén waves induced jump of coronal temperature

2007 ◽  
Vol 44 (3) ◽  
pp. 533-536 ◽  
Author(s):  
T. M. Mishonov ◽  
M. V. Stoev ◽  
Y. G. Maneva
Keyword(s):  
Solar Wind ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Coronal Temperature

Ion flow driven by low frequency Alfvén waves in a low-beta plasma

2021 ◽  
Vol 28 (2) ◽  
pp. 022903
Author(s):  
X. Q. Lu ◽  
L. M. Yu ◽  
W. Guo ◽  
K. H. Li
Keyword(s):  
Low Frequency ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Ion Flow
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