Document Type : Research

Authors

• Davood Kalhor ¹
• Sohrab Heydari ²

¹ Damghan University

² School of Physics, University of Damghan, Damghan, Iran

Abstract

The dispersion of electromagnetic waves in plasma and quasi-conductive environments is importance. In this study, the dispersion of electromagnetic waves in a weakly ionized dusty plasma under the influence of external magnetic fields, electric fields, and gravity is investigated. First, the governing equations of the dusty plasma are formulated after appropriate simplifications. To investigate the effects of dispersion, plots of frequency and absorption coefficient as functions of wave number are used. Dust parameters, including average dust particle size, dust density, and electric charge, are varied by three selected values to investigate the effect of dispersion on wave propagation. The results show that the physical properties of dust significantly change the dispersion curve of the dust plasma environment, such that increasing the size and density of dust particles generally reduces the dispersion effects. But as the electrical charge of dust particles increases, the interaction between the dust component and electromagnetic fields becomes stronger, leading to increased scattering effects. Furthermore, the plots show that although the frequency and absorption initially increase with increasing wavenumber, the slopes of the curves gradually decrease, indicating a slower rate of change at higher wavenumbers.

Keywords

• dispersion
• electromagnetic wave
• electrical charge
• wave number