Magnetoacoustic Waves in Partially Ionized Two-Fluid Heat-Releasing Plasma

2020 ◽  
Vol 47 (8) ◽  
pp. 252-256
Author(s):  
N. E. Molevich ◽  
S. Yu. Pichugin ◽  
D. S. Ryashchikov
Keyword(s):  
Magnetoacoustic Waves ◽  
Partially Ionized ◽  
Two Fluid

scholarly journals MAGNETOACOUSTIC WAVES IN A PARTIALLY IONIZED TWO-FLUID PLASMA

2013 ◽  
Vol 209 (1) ◽  
pp. 16 ◽  
Author(s):  
Roberto Soler ◽  
Marc Carbonell ◽  
Jose Luis Ballester
Keyword(s):  
Magnetoacoustic Waves ◽  
Partially Ionized ◽  
Two Fluid ◽  
Two Fluid Plasma

scholarly journals Magnetohydrodynamic waves in solar partially ionized plasmas: two-fluid approach

2011 ◽  
Vol 529 ◽  
pp. A82 ◽  
Author(s):  
T. V. Zaqarashvili ◽  
M. L. Khodachenko ◽  
H. O. Rucker
Keyword(s):  
Magnetohydrodynamic Waves ◽  
Ionized Plasmas ◽  
Partially Ionized Plasmas ◽  
Partially Ionized ◽  
Two Fluid

Partially Ionized Solar Atmosphere: Two-fluid Waves and Their Cutoffs

2019 ◽  
Vol 882 (1) ◽  
pp. 32 ◽  
Author(s):  
D. Wójcik ◽  
K. Murawski ◽  
Z. E. Musielak
Keyword(s):  
Solar Atmosphere ◽  
Partially Ionized ◽  
Two Fluid

Nonlinear coupling between upper-hybrid and magnetoacoustic waves in partially ionized gases

1996 ◽  
Vol T63 ◽  
pp. 266-268
Author(s):  
Srinivas Jammalamadaka ◽  
Padma K Shukla
Keyword(s):  
Nonlinear Coupling ◽  
Magnetoacoustic Waves ◽  
Partially Ionized

scholarly journals ALFVÉN WAVES IN A PARTIALLY IONIZED TWO-FLUID PLASMA

2013 ◽  
Vol 767 (2) ◽  
pp. 171 ◽  
Author(s):  
R. Soler ◽  
M. Carbonell ◽  
J. L. Ballester ◽  
J. Terradas
Keyword(s):  
Alfven Waves ◽  
Alfvén Waves ◽  
Partially Ionized ◽  
Two Fluid ◽  
Two Fluid Plasma

 Acoustic/shock wave heating in the gravitationally stratified partially ionized plasmas: the two-fluid effects 

2021 ◽  
Author(s):  
Fan Zhang ◽  
Stefaan Poedts ◽  
Andrea Lani ◽  
Błażej Kuźma ◽  
Kris Murawski
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
Acoustic Waves ◽  
Ionized Plasmas ◽  
Wave Heating ◽  
Acoustic Shock Wave ◽  
Ionization Fraction ◽  
Partially Ionized Plasmas ◽  
Partially Ionized ◽  
Two Fluid

<p> The chromospheric heating problem is a long-standing intriguing topic of solar physics, and the acoustic wave/shock wave heating in the chromospheric plasma has been investigated in the last several decades. It has been confirmed that acoustic waves, and the shock waves induced by the steepening acoustic waves in the gravitationally stratified chromospheric plasma, are able to transport energy to the chromosphere, but the energy supplied in this way is not necessarily sufficient for heating the chromosphere. Here, we further investigate the acoustic/shock wave heating process while taking into account the two-fluid effects.</p><p> As the plasma in the chromosphere is weakly or partially ionized,  neutrals play an important role in wave propagation in this region. Therefore,  a two-fluid computational model treating neutrals and charged particles (electrons and ions) as two separate fluids is used for modelling the acoustic/shock wave propagation in idealised partially ionized plasmas, while taking into account the ion-neutral collisions, ionization and recombination. We have thus investigated  the collisional and reactive interactions between separated ions and neutrals, as well as the resulting effects in the acoustic/shock wave propagation and damping. In the numerical simulations, both the initial hydrostatic equilibrium and chemical equilibrium are taken into account to provide different density profiles for comparison.</p><p>We have found that the shock heating in the partially ionized plasmas strongly depends on the ionization fraction. In particular, the relatively smaller ionization fraction resulting from the initial chemical equilibrium significantly enhances the shock wave heating, which dominates the overall heating effect according to an approximated quantitative comparison. Moreover, the decoupling between ions and neutrals is also enhanced while considering ionization and recombination, resulting in stronger collisional heating.</p>

scholarly journals Spatial variation of periods of ion and neutral waves in a solar magnetic arcade.

2021 ◽  
Author(s):  
Błażej Kuźma ◽  
Kris Murawski ◽  
Zdzisław Musielak ◽  
Stefaan Poedts ◽  
Dariusz Wójcik
Keyword(s):  
Magnetic Field ◽  
Solar Atmosphere ◽  
Gravity Waves ◽  
Solar Photosphere ◽  
Acoustic Gravity Waves ◽  
Partially Ionized ◽  
The Impact ◽  
Two Fluid ◽  
Lower Solar Atmosphere ◽  
Magnetic Arcade

<p>We present a new insight into the propagation of ion magnetoacoustic and neutral acoustic waves in a magnetic arcade in the lower solar atmosphere. By means of numerical simulations, we aim to: (a) study two-fluid waves propagating in a magnetic arcade embedded in the partially-ionized, lower solar atmosphere; and (b) investigate the impact of the background magneticfield configuration on the observed wave-periods. We consider a 2D approximation of the gravitationally stratified and partially-ionized lower solar atmosphere consisting of ion + electron and neutral fluids that are coupled by ion-neutral collisions. In this model, the convection below the photosphere is responsible for the excitation of ion magnetoacoustic-gravity and neutral acoustic-gravity waves. We find that in the solar photosphere, where ions and neutrals are strongly coupled by collisions, magnetoacoustic-gravity and acoustic-gravity waves have periods ranging from250s to350s. In the chromosphere, where the collisional coupling is weak, the wave characteristics strongly depend on the magnetic field configuration. Above the foot-points of the considered arcade, the plasma is dominated by vertical magnetic field along which ion slow magnetoacoustic-gravity waves are guided. These waves exhibit a broad range of periods with the most prominent periods of 180 s, 220 s, and 300 s. Above the main loop of the solar arcade, where mostly horizontal magnetic field lines guide ion magnetoacoustic waves, the main spectral power reduces to the period of about 180 s and longer wave-periods do not exist. The obtained results demonstrate unprecedented, never reported before level of agreement with the recently reported observational data of Wisniewska et al. (2016) and Kayshap et al. (2018). We demonstrate that the two-fluid approach is indeed crucial for a description of wave-related processes in the lower solar atmosphere, with energy transport and dissipation being of the highest interest among them.</p>

Sign in / Sign up

Export Citation Format

Share Document