English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The characteristics of Alfv\'en waves propagating in a direction oblique tothe ambient magnetic field in a stellar wind environment are discussed. Akinetic formulation for a magnetized dusty plasma is adopted consideringMaxwellian distributions of electrons and ions, and immobile dust particleselectrically charged by absorption of plasma particles and by photoionization.The dispersion relation is numerically solved and the results are compared withsituations previously studied where dust particles were not charged byphotoionization, which is an important process in a stellar wind of arelatively hot star. We show that the presence of dust causes the shearAlfv\'en waves to present a region of wavenumber values with zero frequency andthat the minimum wavelength for which the mode becomes dispersive again isroughly proportional to the radiation intensity to which the dust grains areexposed. The damping rates of both shear and compressional Alfv\'en waves areobserved to decrease with increasing radiation flux, for the parametersconsidered. For the particular case where both modes present a region with nullreal frequency when the radiation flux is absent or weak, it is shown that whenthe radiation flux is sufficiently strong, the photoionization mechanism maycause this region to get smaller or even to vanish, for compressional Alfv\'enwaves. In that case, the compressional Alfv\'en waves present non zerofrequency for all wavenumber values, while the shear Alfv\'en waves stillpresent null frequency in a certain interval of wavenumber values, which getssmaller with the presence of radiation.

Oblique Alfv\'en waves in a stellar wind environment with dust particles charged by inelastic collisions and by photoionization