Thermal Misbalance Influence on the Nonlinear Shear Alfvén Waves Under Solar Atmosphere Conditions

Белов, С. А.; Molevich, N. E.; Zavershinskii, D. I.

doi:10.1007/s11207-020-01726-9

Cited by 11 publications

(5 citation statements)

References 71 publications

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“…However, the non-ideal plasma conditions may affect the evolution of various MHD waves ans associated plasma dynamics. Recently, the slow magnetoacoustic waves were found to be affected by the thermal misbalance between heating and cooling processes of the plasma (e.g., Nakariakov et al 2017;Kolotkov et al 2019Kolotkov et al , 2020Belov et al 2020, and references cited there). have recently reported that Alfvén waves can trigger the longitudinal motions of the confined plasma under the effect of heating-cooling misbalance.…”

Section: Discussionmentioning

confidence: 99%

Quasi-periodic spicule-like cool jets driven by Alfvén pulses

Balveer¹,

Srivastava²,

Sharma³

et al. 2022

Preprint

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We perform a 2.5 dimensional magnetohydrodynamic (MHD) simulation to understand a comprehensive view of the formation of spicule-like cool jets due to initial transverse velocity pulses akin to Alfvén pulses in the solar chromosphere. We invoke multiple velocity (V z ) pulses between 1.5 and 2.0 Mm in the solar atmosphere, which create the initial transverse velocity perturbations. These pulses transfer energy non-linearly to the field aligned perturbations due to the ponderomotive force. This physical process further creates the magnetoacoustic shocks followed by quasi-periodic plasma motions in the solar atmosphere. The field aligned magnetoacoustic shocks move upward which subsequently cause quasi-periodic rise and fall of the chromospheric plasma into the overlying corona as a thin and cool spicule-like jets. The magnitude of the initial applied transverse velocity pulses are taken in the range of 50-90 km s −1 . These pulses are found to be strong enough to generate the spicule-like jets. We analyze the evolution, kinematics and energetics of these spicule-like jets. We find that the transported mass flux and kinetic energy density are substantial in the localized solar-corona. These mass motions generate in situ quasi-periodic oscillations on the scale of ≃ 4.0 min above the transition region.

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Section: Discussionmentioning

confidence: 99%

Quasi-periodic spicule-like cool jets driven by Alfvén pulses

Balveer¹,

Srivastava²,

Sharma³

et al. 2022

Preprint

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“…Recently, when studying the damping/amplification of coronal slow waves, thermal misbalance has been considered [21][22][23][24][25][26][27][28][29][30]: this effect of thermal misbalance comes from the fact that when compressive waves are considered, they produce a change in the background thermal equilibrium, because they perturb local thermodynamic parameters-such as density, temperature, etc.-driving a local heating-cooling misbalance. At the same time, feedback between the plasma and the wave appears, and the wave loses or gains energy from the plasma, leading to either wave damping or amplification.…”

Section: Introductionmentioning

confidence: 99%

“…Further studies on this topic, related to coronal structures, have been conducted in Refs. [21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Coupling of Alfvén and Slow Magnetoacoustic Waves in Partially Ionized Solar Plasmas: The Effect of Thermal Misbalance

Ballester¹

2023

Physics

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Solar chromosphere and photosphere, as well as solar atmospheric structures, such as prominences and spicules, are made of partially ionized plasmas. Observations have reported the presence of damped or amplified oscillations in these solar plasmas, which have been interpreted in terms of magnetohydrodynamic (MHD) waves. Slow magnetoacoustic waves could be responsible for these oscillations. The present study investigates the temporal behavior of the field-aligned motions that represent slow magnetoacoustic waves excited in a partially ionized prominence plasma by the ponderomotive force. Starting from single-fluid MHD equations, including radiative losses, a heating mechanism and ambipolar diffusion, and using a regular perturbation method, first- and second-order partial differential equations have been derived. By numerically solving second-order equations describing field-aligned motions, the temporal behavior of the longitudinal velocity perturbations is obtained. The damping or amplification of these perturbations can be explained in terms of heating–cooling misbalance, the damping effect due to ambipolar diffusion and the variation of the first adiabatic exponent with temperature and ionization degree.

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“…In the coronal context and related with the study of damping/amplification of slow waves, thermal misbalance between heating and cooling has been considered by Nakariakov et al ( 2017), Zavershinskii et al (2019), Kolotkov, Nakariakov, and Zavershinskii (2019), Kolotkov, Duckenfield, and Nakariakov (2020), Belov, Molevich, and Zavershinskii (2020), Prasad, Srivastava, and Wang (2021a,b), Belov et al (2021), Zavershinskii et al (2021), Belov, Molevich, and Zavershinskii (2021), Prasad et al (2022). This thermal misbalance is attributed to compressive waves that change the local thermal equilibrium and perturb the density, temperature, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Next, Kolotkov, Duckenfield, and Nakariakov (2020) assuming, again, thermal misbalance and an infinite magnetic field, used slow waves and different values for a and b to determine the conditions needed for the damping or amplification of slow and thermal waves in coronal-loop plasmas obtaining, at the same time, constraints on the solar-coronal heating function. Thermal misbalance has also been taken into account in the study of nonlinear shear Alfvén waves, and the effect is to modify the steepening and the amplitude of the wave under chromospheric or coronal-hole conditions (Belov, Molevich, and Zavershinskii, 2020). Related again with coronal loops, Prasad, Srivastava, and Wang (2021b) made a comparison between the effect of viscosity and thermal conduction on the damping of slow waves with and without thermal misbalance.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Misbalance on Slow Magnetoacoustic Waves in a Partially Ionized Prominence-Like Plasma

Ibanez¹,

Ballester²

2022

Sol Phys

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Solar prominences are partially ionized plasma structures embedded in the solar corona. Ground- and space-based observations have confirmed the presence of oscillatory motions in prominences, which have been interpreted in terms of standing or propagating MHD waves. Some of these observations suggest that slow magnetoacoustic waves could be responsible for these oscillations and have provided us with evidence about their damping/amplification with very small ratios between damping/amplifying times and periods, which have been difficult to explain from a theoretical point of view. Here we investigate the temporal behavior of non-adiabatic, slow, magnetoacoustic waves when a heating–cooling misbalance is present. The influence of optically thin losses and of a general heating term, in which density and temperature dependence can be modified, as well as the effect of partial ionization have been considered. Furthermore, a tentative example of how, using observational data, the observed ratio between damping/amplifying times and periods could be matched with those theoretically obtained is shown. In summary, different combinations of radiative losses, heating mechanisms, and typical wavenumbers, together with the effect of partial ionization, could provide a theoretical tool able to reproduce observational results on small-amplitude oscillations in prominences.

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Thermal Misbalance Influence on the Nonlinear Shear Alfvén Waves Under Solar Atmosphere Conditions

Cited by 11 publications

References 71 publications

Quasi-periodic spicule-like cool jets driven by Alfvén pulses

Quasi-periodic spicule-like cool jets driven by Alfvén pulses

Nonlinear Coupling of Alfvén and Slow Magnetoacoustic Waves in Partially Ionized Solar Plasmas: The Effect of Thermal Misbalance

The Effect of Thermal Misbalance on Slow Magnetoacoustic Waves in a Partially Ionized Prominence-Like Plasma

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