电磁波被尘埃等离子体散射的功率谱
SCATTER SPECTRUM OF RADIO WAVES BY A DUSTY PLASMA
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摘要: 用等离子体动力论导出的动力形状因子研究尘埃等离子体的散射功率谱。结果表明由于尘埃粒子具有大的荷电量,对于冷电子的非相干散射,即kD1(D是德拜屏蔽长度,k=|K|=|Ks-K0|,K0是入射波矢, Ks是散射波矢),尘埃粒子极大地影响散射谱的特征。散射功率谱在尘埃粒子声波频移处出现特征峰。Abstract: The scatter spectrum of radio waves by a dusty plasma has been studed with the dynamic factor which was derived from the kinetic theory. It is found that for the case of cooled electrons kD1 (D is the Debye length, and k=|k|=|ks-k0|, k0 and ks is the incident and scatter wave vector, respectivly) the dusty paticles play an important role in the scattering due to its huge charge number. There is a characteristic spiky fine structure in the scatter spectrum, which is of the dust-acoustic wave frequency shift.
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Shukla P K, Mendis D A, Desai T. Advances in Dusty Plasma, Singapore: World Scientific, 1997, Chap.I-III.[2]Havnes O, Melandso F, Hartquist T, Alaksen T. Charge dust on the Earths mesopause: Effects on radar backscatter, Physica Scripta, 1992, 45(5): 535-544.[3]Fejer J. Scattering of radiowaves by an ionozed gas in the thermal equilibrium, Can. J. Phys., 1960, 38: 1114-1133.[4]Li F, Tsytovich V N. Dynamic spectral density function of a dusty plasma, Phys. Rev. E, 1996, 53(2): 1028-1034.[5]Rottger J, La Hoz C J. Characteristics of polar mesosphere summer echoes (PMSE) observed with the EISCAT 224MHz radar and possible explanations of their origin, J. Atm. Terr. Phys. 1990, 52(10/11): 893-898. -
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