Compressional plasma perturbations may cause thermal misbalance between plasma-heating and -cooling processes. This misbalance significantly affects the dispersion properties of compressional waves providing a feedback between the perturbations and plasmas. It has been shown that Alfvén waves may induce longitudinal (compressional) plasma motions. In the present study, we analyze the effects of thermal misbalance caused by longitudinal plasma motions induced by shear Alfvén waves. We show that thermal misbalance leads to appearance of exponential bulk flows, which themselves modify the Alfvén-induced plasma motions. In the case of sinusoidal Alfvén waves, we show how the amplitude and phase shift of induced longitudinal motions gain dependence on the Alfvén wave frequency while shedding light on its functionality. This feature has been investigated analytically in application to coronal conditions. We also consider the evolution of longitudinal plasma motions induced by the shear sinusoidal Alfvén wave by numerical methods before comparing the results obtained with our presented analytical predictions to justify the model under consideration in the present study.
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The study was supported in part by the Ministry of Education and Science of Russia by State assignment to educational and research institutions under Project No. FSSS-2020-0014 and No. 0023-2019-0003, and by RFBR, project number 20-32-90018. CHIANTI is a collaborative project involving George Mason University, the University of Michigan (USA), University of Cambridge (UK) and NASA Goddard Space Flight Center (USA).
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This article belongs to the Topical Collection:
Magnetohydrodynamic (MHD) Waves and Oscillations in the Sun’s Corona and MHD Coronal Seismology
Guest Editors: Dmitrii Kolotkov and Bo Li
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Belov, S., Vasheghani Farahani, S., Molevich, N. et al. Longitudinal Plasma Motions Generated by Shear Alfvén Waves in Plasma with Thermal Misbalance. Sol Phys 296, 98 (2021). https://doi.org/10.1007/s11207-021-01850-0
- Waves, Alfven
- Coronal seismology