2021/09/10 by L. B. De Toni, L B De Toni, R. Gaelzer · 7 citations
Physics and Astronomy · #Atomic physics #Computational physics #Dispersion relation #Dust and Plasma Wave Phenomena #Electron #Ion #Ionization #Ionosphere and magnetosphere dynamics #Nuclear physics #Photoionization #Physics #Quantum mechanics #Solar and Space Plasma Dynamics #Wavenumber #Whistler #astro-ph.SR #physics.plasm-ph
paper · pdf · doi:10.1093/mnras/stab2603
published in Monthly Notices of the Royal Astronomical Society 508(1), 340-351 (Oxford University Press) · 12 pages, 6 figures. Monthly Notices of the Royal Astronomical Society, 2021
openalex publication_date 2021/09/10 · arxiv created 2021/09/13 · arxiv updated 2021/09/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
ABSTRACT Using a kinetic description of a homogeneous magnetized dusty plasma with Maxwellian distribution of electrons and protons and dust particles charged by inelastic collisions and by photoionization, we analyse the dispersion relation considering the case where waves and radiation propagate exactly parallel to the ambient magnetic field. The investigation emphasizes the changes that the photoionization process brings to the propagation and damping of the waves in a stellar wind environment, since Alfvén waves are believed to play a significant role in the heating and acceleration processes that take place in the wind. The results show that, in the presence of dust with negative equilibrium electrical charge, the Alfvén mode decouples into the whistler and ion cyclotron modes for all values of wavenumber, but when dust particles acquire neutral or positive values of electrical charge, these modes may couple for certain values of wavenumber. It is also seen that the whistler and ion cyclotron modes present null group velocity in an interval of small wavenumber, and that the maximum value of wavenumber for which the waves are non-propagating is reduced in the presence of the photoionization process. For very small values of wavenumber, the damping rates of the modes could change significantly from very small to very high values if the sign of the dust electrical charge is changed.