Abstract
A numerical model describing kinetic Alfven waves (AWs) turbulence in coronal magnetic structure like coronal loops is presented. The governing equation representing kinetic AWs is derived using a two-fluid approach and solved by a pseudospectral method for efficient numerical simulation including effects of density fluctuations. We examined the transient dynamics of kinetic AWs through modified density resulting from associated ponderomotive effects, and the background density fluctuations. The evolution of coherent magnetic structures or magnetic slabs/filaments is studied. In addition, the turbulence possibly generated by kinetic AWs in coronal loops is examined with the help of power spectra for different values of density fluctuation amplitudes (\(\mu \)). The spectra follow a Kolmogorov-like scaling (\(\sim \text{k}^{-5/3}\)) in inertial range, followed by a steeper spectra with a scaling of k−3.5 in the dissipation range. The steepening of spectra from inertial to dissipation range may indicate a stochastic energization of charged particles by manifold interactions with magnetic fluctuations, redistribution of energy from lower to higher modes of wavenumber and an energy cascade. Finally, magnetic slabs/filaments formation and turbulence by kinetic AWs inside loops numerically studied in this work can be considered as key mechanisms responsible for particle energization and heating of plasma in coronal loops.
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This work is partially supported by the Department of Science and Technology [DST], India and Indian Space Research Organization [ISRO] under RESPOND program.
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All authors contributed equally for the preparation of this manuscript. Analytical derivation and numerical analysis were performed by [Anju Kumari], [Sanjay Kumar] and [R.P. Sharma]. The first draft of the manuscript was written by [Anju Kumari] and other authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Kumari, A., Kumar, S. & Sharma, R.P. Nonlinear kinetic Alfvén-wave localized structures and turbulence generation in the solar corona. Astrophys Space Sci 367, 95 (2022). https://doi.org/10.1007/s10509-022-04126-6
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DOI: https://doi.org/10.1007/s10509-022-04126-6