Abstract Details
| Name: Souvik Das Affiliation: Tezpur University Conference ID: ASI2025_35 Title : Analytic investigation of collective fluctuation dynamics in nonthermal solar plasmas Authors and Co-Authors : Souvik Das, Pralay Kumar Karmakar Abstract Type : Poster Abstract Category : Sun, Solar System, Exoplanets, and Astrobiology Abstract : A rich variety of waves and oscillations are ubiquitously found in the entire solar plasma spatiotemporal regime. The non-radial longitudinal helioseismic modes are one kind of these waves providing solid diagnostic tools to probe the solar interior. A local spherical (non-planar) linear perturbation analysis on the kappa-modified viscoturbulent nonthermal solar plasmas is herein methodically carried out. It yields a unique linear cubic dispersion relation for the self-gravitationally bounded solar plasma system. The multi-parametric dispersion signatures sensitively depend on the electron nonthermality, electronic temperature, fluid dynamic viscosity, thermal conductivity, and geometrical curvature effects. Diverse modal features of the helioseismic gravity mode (g-mode) and acoustic mode (p-mode) are analytically explored. The low-frequency g-mode dominates only in the deeper constituent concentric layers of the Sun. The high-frequency p-mode propagates throughout the Sun up to its surface. The existence of the solar five-minute oscillation is theoretically confirmed. The electron nonthermality spectral index, plasma temperature, and thermal conductivity serve as modal velocity accelerating agents. The dynamic viscosity plays the role of a decelerating one. The radially outward photospheric p-mode energy flux density is estimated analytically as 1-100 kW per unit area. Sufficient leakage of this longitudinal p-mode energy flux contributes significantly to the chromospheric transverse spicule oscillation formation through mode conversion processes. From several observational data, the spicule oscillation energy is obtained as 10 kW per unit area. The proposed analysis justifiably and reliably corroborates with numerous solar observational and theoretical modal signatures existing in the literature. |