Kinetics of illuminated complex plasmas considering Mie scattering by spherical dust particles with a size distribution

Sodha, M. S.; Mishra, S. K.; Misra, Shikha

doi:10.1063/1.3525057

Cited by 26 publications

(10 citation statements)

References 36 publications

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“…1:6k $ 190 nm) and hence Mie scattering is not relevant. 37 The theory presented herein has the following two limitations: (i) Applicable in Geometrical Optics approximation, i.e., 2pa=k $ 10 (Mie scattering is neglected) and (ii) very low number density of the dust particles so that the structure of photoelectron sheath remains unaffected. This theory should provide adequate basis for laboratory work.…”

Section: Resultsmentioning

confidence: 99%

Lunar photoelectron sheath and levitation of dust

Sodha

Mishra

2014

Physics of Plasmas

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The decision to launch Luna Glob and Luna Resus satellites, carrying instrumentation to investigate the structure of photoelectron sheath and levitation of dust particles in the sheath, adjacent to the surface of the moon has intensified interest in this exciting area. The present analysis incorporates the following novel features: (i) In contrast to intuitive half Maxwellian (M) distribution of velocities of the photoelectrons, emitted from the surface of the moon, which corresponds to an arbitrary temperature, a well-established half Fermi Dirac (F-D) distribution [R. H. Fowler, Phys. Rev. 38, 45 (1931)] has been used, (ii) the profiles for electric potential, electric field, and electron density have been derived (not a priori assumed), (iii) an expression for the rate of electron accretion on a positively charged dust particle, which takes account of the anisotropic flux of electrons has been derived and used in the analysis, and (iv) a derived (rather than intuitive) expression for the rate of photoelectron emission from a positively charged dust particle has been used for the first time in such analyses. The profiles of the electric potential, electric field, and electron density in the photoelectric sheath have been evaluated for typical lunar environment and used to obtain the profile of the radius of a dust particle for levitation. The dependence of the electric potential on the surface of the moon on the parameters of the solar wind and photo-efficiency of the material of moon's surface has also been discussed. It is seen that the results based on half F-D distribution are significantly different from those obtained on the basis of M-distribution. V C 2014 AIP Publishing LLC. [http://dx.

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Section: Resultsmentioning

confidence: 99%

Lunar photoelectron sheath and levitation of dust

Sodha

Mishra

2014

Physics of Plasmas

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“…The arbitrary range of Z may be estimated around mean charge Z on the dust particles, obtained by average charge theory. 66 For such a chosen range, Eq. (2) yields a set of equations for n Z .…”

Section: Computational Methodologymentioning

confidence: 99%

“…These investigations did not consider photo-detachment of O 2 an important process at mesospheric altitudes. 57,58 The aim of the present paper is restricted to formulating the number and energy balance equations (as in recent papers by our group [59][60][61][62][63][64][65][66][67][68], solving them for realistic [Havnes et al 11 ] values of parameters, and explaining the charge distribution on the particles (listed in Table I) and the change in the electron density, induced by the presence of dust; the corresponding values of electron density, temperature, collision frequency, and diffusivity have also been evaluated. The starting point is a model (Table II) of the mesosphere in the absence of dust, which takes into account, the processes, mentioned herein and predicts an electron density in close agreement with the observed value; incidentally the model predicts an electron temperature a little larger than the observed value.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of polar mesospheric plasma layers: Comparison of theoretical results with observations

et al. 2011

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This paper presents an analytical model for the physical understanding of the charge distribution on ice dust particles in plasma layers of polar mesospheric clouds PMCs (Noctilucent clouds and polar mesospheric summer echoes). For the case of pure ice dust (with high work function), the charging of the particles occurs only because of the accretion of electronic and ionic species on the surface of ice grains. The analysis is based on the number and energy balance of constituents and allows the charge to be only an integral multiple (positive or negative) of the electronic charge. Amongst other interesting results, the theory explains the observed charge distribution on pure ice particles and corresponding reduction of electron density (viz., Bite out) in the PMCs.

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“…On the basis of previous literature and the available data, in this paper, we present an investigation of the charging kinetics (Sodha et al 2010a,c,d; Sodha, Misra & Mishra 2010b; Sodha, Mishra & Misra 2011a,b,c,d; Mishra, Misra & Sodha 2011) of the ice grains characterized by the observed size distribution (Juhasz & Horanyi 2002; Kempf et al 2006) in the E‐belt region at different radial distances, in particular near the environment of the orbits of Saturn’s icy satellites. In view of the recent work by Postberg et al (2009, 2011), 90 per cent of the particles have been assumed to have a work function corresponding to that of pure ice, while the remaining 10 per cent (dirty ice grains) are assumed to have a lower work function.…”

Section: Introductionmentioning

confidence: 99%

Charging of ice grains in Saturn’s E ring: theory and observations

Misra¹,

Mishra²,

Sodha³

2012

Monthly Notices of the Royal Astronomical Society

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We have developed a theoretical model for a physical understanding of the charging of ice grains in the plasma of Saturn's E ring. The evaluated results are compared with the available observations and measurements from the Cassini, Hubble Space Telescope, Voyager and Pioneer campaigns. In this formulation, we implement the uniform potential theory, taking into account the size distribution of ice grains, in order to investigate the charging kinetics. The analysis is based on the number and energy balance of the constituents with inherent charge neutrality in the complex plasma system. In this paper, we incorporate pure ice as well as sodium-enriched ice particles. For computational purposes, we have considered only the plasma environment near the orbits of Saturn's icy moons. As an interesting feature, the theory explains the observed range of potential on the ice grains in Saturn's E ring. The available data on the plasma of Saturn's E ring and the size distribution of ice particles have been used in the computations.

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Kinetics of illuminated complex plasmas considering Mie scattering by spherical dust particles with a size distribution

Cited by 26 publications

References 36 publications

Lunar photoelectron sheath and levitation of dust

Lunar photoelectron sheath and levitation of dust

Kinetics of polar mesospheric plasma layers: Comparison of theoretical results with observations

Charging of ice grains in Saturn’s E ring: theory and observations

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