Effect of orbital angular momentum on electron acoustic waves in double‐Kappa plasma
| Autor: | S. Ali Shan, Aman-ur Rehman, M. Yousaf Hamza, Jae Koo Lee |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Angular momentum Acoustic wave Electron 01 natural sciences 010305 fluids & plasmas Geophysics Space and Planetary Science Total angular momentum quantum number 0103 physical sciences Angular momentum of light Angular momentum coupling Wavenumber Orbital angular momentum of light Atomic physics 010306 general physics |
| Zdroj: | Journal of Geophysical Research: Space Physics. 122:1690-1701 |
| ISSN: | 2169-9402 2169-9380 |
| Popis: | Kinetic theory of electron acoustic waves (EAWs) in the presence of wave angular momentum has been derived to study the effect of wave angular momentum on the propagation of EAWs in a non-Maxwellian plasma. Both types of electrons (hot and cool) are modeled as Kappa distributed velocity distribution functions. The theory is also applied to Saturn's magnetosphere where these kinds of distribution functions are commonly found. It is seen that the presence of wave angular momentum in the model has a significant effect on the existence of the regions where EAWs are weakly damped. The effect of wave angular momentum on EAWs is studied by defining a parameter η = k/(lqθ), which is the ratio of the planar wave number to the azimuthal wave number. The wave is purely planar if η→∞. The weakly damped region of EAWs depends strongly on this parameter in addition to other parameters such as hot electron spectral index κh, cool electron spectral index κc, the fraction of hot electrons, and hot to cool electrons temperature ratio. The results also show the effect of η on the propagation of EAWs in various region of the Saturn's magnetosphere. |
| Databáze: | OpenAIRE |
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