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Two-fluid simulations of waves in the solar chromosphere
- Source :
- Astronomy & Astrophysics. 630:A79
- Publication Year :
- 2019
- Publisher :
- EDP Sciences, 2019.
-
Abstract
- Waves and shocks traveling through the solar chromospheric plasma are influenced by its partial ionization and weak collisional coupling, and may become susceptible to multi-fluid effects, similar to interstellar shock waves. In this study, we consider fast magneto-acoustic shock wave formation and propagation in a stratified medium, that is permeated by a horizontal magnetic field, with properties similar to that of the solar chromosphere. The evolution of plasma and neutrals is modeled using a two-fluid code that evolves a set of coupled equations for two separate fluids. We observed that waves in neutrals and plasma, initially coupled at the upper photosphere, become uncoupled at higher heights in the chromosphere. This decoupling can be a consequence of either the characteristic spatial scale at the shock front, that becomes similar to the collisional scale, or the change in the relation between the wave frequency, ion cyclotron frequency, and the collisional frequency with height. The decoupling height is a sensitive function of the wave frequency, wave amplitude, and the magnetic field strength. We observed that decoupling causes damping of waves and an increase in the background temperature due to the frictional heating. The comparison between analytical and numerical results allows us to separate the role of the nonlinear effects from the linear ones on the decoupling and damping of waves.
- Subjects :
- Physics
Shock wave
Photosphere
010308 nuclear & particles physics
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Acoustic wave
Decoupling (cosmology)
Plasma
01 natural sciences
Computational physics
Magnetic field
Amplitude
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Space and Planetary Science
Physics::Space Physics
0103 physical sciences
010303 astronomy & astrophysics
Chromosphere
Solar and Stellar Astrophysics (astro-ph.SR)
Subjects
Details
- ISSN :
- 14320746 and 00046361
- Volume :
- 630
- Database :
- OpenAIRE
- Journal :
- Astronomy & Astrophysics
- Accession number :
- edsair.doi.dedup.....f864e6f450d88730e5c5a264e7243923
- Full Text :
- https://doi.org/10.1051/0004-6361/201935844