Two-fluid numerical model of chromospheric heating and plasma outflows in a quiet-Sun

Murawski, K.; Musielak, Z. E.; Poedts, Stefaan; Srivastava, A. K.; Kadowaki, L. H. S.

doi:10.1007/s10509-022-04152-4

Cited by 4 publications

(13 citation statements)

References 81 publications

(110 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here, symbols n ( i ) denote the mass density of the neutrals (ions), V n (V i ) the velocity of the neutrals (ions), p n (p ie ) the neutral (ion+electron) gas pressure with p ie = p i + p e = 2p i , B the magnetic field, η the magnetic resistivity coefficient taken in its simplified form as η = ( i ν ei + n ν en )/(e 2 n 2 e ) where ν en and ν ei are respectively the electron-neutral and electron-ion collisions frequencies [47], μ the magnetic permeability of the medium, γ = 5/3 the adiabatic index, T i (T n ) is the proton (hydrogen atom) temperature, μ i = μ n = 1 are the mean masses of plasma species and neutrals, respectively, m H is the hydrogen mass, k B is Boltzmann's constant, g = [0, −g, 0] the vector of gravitational acceleration with its magnitude g = 274.78 m s −2 , acting along the y-axis in Cartesian coordinates. The reaction rates of the electron impact ionization and radiative recombination, Γ ion,rec i,n , momentum collisional, S i,n , and energy source, Q i,n , terms are described in great detail in [42]…”

Section: Two-fluid Model Of the Solar Atmosphere (A) Two-fluid Equationsmentioning

confidence: 99%

“…In our work, we use the recently developed [33,35] and improved [42] numerical model to simulate a quasi-stationary, yet highly dynamic in small scales solar atmosphere, with the aim to obtain cutoffs variation with height. The latter takes into account interactions between ions and neutrals in partially ionized plasma and is compared with the recently reported observational data [28,29].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetoacoustic cutoff effect in numerical simulations of the partially ionized solar atmosphere

Kuźma,

Kadowaki,

Murawski

et al. 2024

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

The cutoff effect is a significant determinant of solar magnetohydrodynamic wave propagation and hence pivotal in energy transfer studies, such as solar plasma heating and seismological diagnostics. Despite continuous efforts, no good agreement between observed waveperiods and theory or numerical simulations was found. Our objective is to investigate the magnetoacoustic cutoff effect in the partially ionized solar atmosphere, factoring in the two-fluid effects. We developed a two-fluid MHD numerical model and used it to simulate a quiet region of the Sun from the top of the convective zone to the low corona. Our findings show that the ongoing granulation excites a wide range of waves propagating into the upper atmospheric layers. The cutoff waveperiods strongly depend on the height. Two-fluid waveperiods obtained with numerical simulations reproduce the recent observations at a very good level of compliance. Furthermore, direct comparison with strongly coupled cases that imitate the single-fluid approximation have shown that the waveperiod propagation pattern is only present in fully two-fluid simulations. We conclude that the presence of neutrals and therefore collisional terms change the dynamics of the magnetized plasma, in comparison with the single-fluid approximation. This effect is more prominently seen in the upper photosphere and chromosphere. This article is part of the theme issue ‘Partially ionized plasma of the solar atmosphere: recent advances and future pathways’.

show abstract

Section: Two-fluid Model Of the Solar Atmosphere (A) Two-fluid Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetoacoustic cutoff effect in numerical simulations of the partially ionized solar atmosphere

Kuźma,

Kadowaki,

Murawski

et al. 2024

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…We also take into account the thermal conduction which contributes to the formation/dynamics of the cool jets. The governing equations of two-fluid systems in the solar magnetized plasma are given as follows [56,58,61,[63][64][65][66][67][68][69][70]:…”

Section: Model and Initial Configuration (A) The Two-fluid Modelmentioning

confidence: 99%

“…Here, κ n depicts the coefficient of thermal conduction in case of neutrals which is expressed as [70,74]…”

Section: Model and Initial Configuration (A) The Two-fluid Modelmentioning

confidence: 99%

See 1 more Smart Citation

Alfvén pulse driven spicule-like jets in the presence of thermal conduction and ion-neutral collision in two-fluid regime

Srivastava,

Singh,

Singh

et al. 2024

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

We present the formation of quasi-periodic cool spicule-like jets in the solar atmosphere using 2.5-D numerical simulation in two-fluid regime (ions+neutrals) under the presence of thermal conduction and ion-neutral collision. The nonlinear, impulsive Alfvénic perturbations at the top of the photosphere trigger field aligned magnetoacoustic perturbations due to ponderomotive force. The transport of energy from Alfvén pulse to such vertical velocity perturbations due to ponderomotive force is considered as an initial trigger mechanism. Thereafter, these velocity perturbations steepen into the shocks followed by quasi-periodic rise and fall of the cool jets transporting mass in the overlying corona. This article is part of the theme issue ‘Partially ionized plasma of the solar atmosphere: recent advances and future pathways’.

show abstract

Impulsively generated waves in two-fluid plasma in the solar chromosphere: Heating and generation of plasma outflows

Kumar,

Murawski,

Kadowaki

et al. 2024

A&A

Self Cite

View full text Add to dashboard Cite

Context. We present new insights into impulsively generated Alfvén and magneto-acoustic waves in the partially ionized two-fluid plasma of the solar atmosphere and their contribution to chromospheric heating and plasma outflows. Aims. Our study attempts to elucidate the mechanisms responsible for chromospheric heating and excitation of plasma outflows that may contribute to the generation of the solar wind in the upper atmospheric layers. The main aim of this work is to investigate the impulsively generated waves by taking into account two-fluid effects. These effects may alter the wave propagation leading to attenuation and collisional plasma heating. Methods. The two-fluid equations were solved by the JOint ANalytical Numerical Approach (JOANNA) code in a 2.5-dimensional (2.5D) framework to simulate the dynamics of the solar atmosphere. Here, electrons + ions (protons) and neutrals (hydrogen atoms) are treated as separate fluids, which are coupled via ion-neutral collisions. The latter acts as a dissipation mechanism for the energy carried by the waves in two-fluid plasma and may ultimately lead to the frictional heating of the partially ionized plasma. The waves in two-fluid plasma, which are launched from the top of the photosphere, are excited by perturbations induced by localized Gaussian pulses in the horizontal components of the ion and neutral velocities. Results. In the middle and upper chromosphere, a substantial fraction of the energy carried by large amplitude waves in the two-fluid plasma is dissipated in ion-neutral collisions, resulting in the thermalization of wave energy and generation of plasma outflows. We find that coupled Alfvén and magneto-acoustic waves are more effective in heating the chromosphere than magneto-acoustic waves. Conclusions. Large-amplitude waves in the two-fluid plasma may be responsible for heating the chromosphere. The net flow of ions is directed outward, leading to plasma outflows in the lower solar corona, which may contribute to the solar wind at higher altitudes The primary source of wave energy dissipation in the current paradigm comes from collisions between ions and neutrals.

show abstract

Two-fluid numerical model of chromospheric heating and plasma outflows in a quiet-Sun

Cited by 4 publications

References 81 publications

Magnetoacoustic cutoff effect in numerical simulations of the partially ionized solar atmosphere

Magnetoacoustic cutoff effect in numerical simulations of the partially ionized solar atmosphere

Alfvén pulse driven spicule-like jets in the presence of thermal conduction and ion-neutral collision in two-fluid regime

Impulsively generated waves in two-fluid plasma in the solar chromosphere: Heating and generation of plasma outflows

Contact Info

Product

Resources

About