電磁波被塵埃等離子體散射的功率譜
SCATTER SPECTRUM OF RADIO WAVES BY A DUSTY PLASMA
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摘要: 用等離子體動力論導出的動力形狀因子研究塵埃等離子體的散射功率譜。結(jié)果表明由于塵埃粒子具有大的荷電量,對于冷電子的非相干散射,即kD1(D是德拜屏蔽長度,k=|K|=|Ks-K0|,K0是入射波矢, Ks是散射波矢),塵埃粒子極大地影響散射譜的特征。散射功率譜在塵埃粒子聲波頻移處出現(xiàn)特征峰。
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關(guān)鍵詞:
- 塵埃等離子體; 動力形狀因子; 非相干散射; 散射功率譜
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. -
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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