Abstract
Evolutionary existence of plasma fireballs is a generic phenomenon realizable in diversified physical plasma-dominated circumstances starting from laboratory to astrocosmic scales of space and time. A fair understanding of such fireballs and associated instabilities is really needed to enrich astroplasmic communities from various perspectives of applied value. Naturally occurring plasma fireball events include novae, meteors, stellar structures, etc. We propose a theoretical model formalism to analyse the plasma fireball sheath (PFS) instability with the application of a quasi-linear perturbative analysis on the laboratory spatiotemporal scales. This treatment reduces the steady-state system into a unique second-order ordinary differential equation (ODE) on the perturbed electrostatic potential with variable multiparametric coefficients. A numerical illustrative platform to integrate this ODE results in an atypical set of peakon-type potential-field structures. It is noticed that both potential and field, associated with the peakonic patterns change significantly with the effective radial distance from the reference origin outwards. The variations are more pronounced in the center (steep, stiff) than that in the off-centric regions (non-steep, non-stiff). A colormap obtained with the triangulation of the potential–field correlation with the radial distance, further confirms the PFS stability behaviour in a qualitative corroboration with the previous predictions reported in the literature. The applicability of our analysis in both laboratory and astrocosmic contexts is finally indicated.
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Acknowledgements
The active participation of the fellows of Astrophysical Plasma and Nonlinear Dynamics Research Laboratory, Tezpur University, is thankfully acknowledged. The valuable comments and suggestions received from the anonymous learned referees for scientific improvement are gratefully acknowledged. The financial support from the DST-SERB (Government of India) project (Grant-EMR/2017/003222) is duly recognized.
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This article is part of the Special Issue on "Waves, Instabilities and Structure Formation in Plasmas".
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Dutta, S., Karmakar, P.K. Fireball sheath instability. J Astrophys Astron 43, 64 (2022). https://doi.org/10.1007/s12036-022-09850-7
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DOI: https://doi.org/10.1007/s12036-022-09850-7