A database of optical constants of cosmic dust analogs

Jäger, Cornelia; Ильин, В. П.; Henning, Thomas; Mutschke, H.; Fabian, D.; Semenov, D.; Вощинников, Н. В.

doi:10.1016/s0022-4073(02)00301-1

Cited by 48 publications

(38 citation statements)

References 7 publications

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“…Laboratory experiments suggest that MSPs may consist of hematite, goethite (FeOOH), fayalite (Fe 2 SiO 4 ), and silica (SiO 2 ) [Saunders and Plane, 2006]. Here we considered refractive indices for a variety of compounds including carbon (amorphous), fayalite (crystalline), hematite (crystalline), silica (amorphous), and various olivines and proxenes (crystalline) [Jaeger et al, 2002]. These particles (except SiO 2 ) do not scatter but rather absorb radiation at the SOFIE wavelengths of interest (<2 mm) for particle radii indicated by the MSP models (r < 10 nm).…”

Section: Meteoric Smoke Modelingmentioning

confidence: 99%

First Satellite Observations of Meteoric Smoke in the Middle Atmosphere

Hervig

Gordley

Deaver

et al. 2009

Geophysical Research Letters

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[1] This work describes the first remote observations of meteoric smoke particles (MSPs) from satellite, by the Solar Occultation For Ice Experiment (SOFIE) onboard the Aeronomy of Ice in the Mesosphere (AIM) platform. The measurements show a layer of MSPs from roughly 35 to 85 km altitude, and indicate a seasonal cycle with reduced MSP abundance during polar summer. The measurements agree favorably with model results, and confirm that MSP transport by the global meridional circulation causes the dramatic reduction in MSPs during polar summer. These new observations represent a major advance in our ability to understand a hitherto poorly characterized class of particles that are thought to be important in numerous atmospheric and terrestrial processes. Citation: Hervig, M. E., L. L.

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Section: Meteoric Smoke Modelingmentioning

confidence: 99%

First Satellite Observations of Meteoric Smoke in the Middle Atmosphere

Hervig

Gordley

Deaver

et al. 2009

Geophysical Research Letters

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“…In our calculations presented below, composite particles of several materials are considered. The refractive indices for them were taken from the Jena-Petersburg Database of Optical Constants (JPDOC) which was described by Henning et al (1999) and Jäger et al (2003).…”

Section: Models Of Composite Grainsmentioning

confidence: 99%

Modelling the optical properties of composite and porous interstellar grains

Вощинников

Ильин

Henning

2004

A&A

113

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Abstract. There are indications that interstellar and interplanetary dust grains have an inhomogeneous and fluffy structure. We investigate different methods to describe light scattering by such composite particles. Both a model of layered particles and discrete dipole calculations for particles with Rayleigh and non-Rayleigh inclusions are used. The calculations demonstrate that porosity is a key parameter for determining light scattering. We find that the optical properties of the layered particles depend on the number and position of layers if the number of layers is small ( < ∼ 15). For a larger number of layers the scattering characteristics become independent of the layer sequence. The optical properties of particles with inclusions depend on the size of inclusions provided the porosity is large. The scattering characteristics of very porous particles with inclusions of different sizes are found to be close to those of multi-layered spheres. We compare the results of these calculations with the predictions of the effective medium theories (EMT) which are often used in astronomy as a tool to calculate the optical properties of composite particles. The results of our analysis show that the internal structure of grains (layers versus inclusions) only slightly affects the optics of particles provided the porosity does not exceed 50%. It is also demonstrated that in this case the optical properties of composite grains calculated with EMT agree with the results of the exact method for layered particles. For larger porosity, the standard EMT rules (i.e., Garnett and Bruggeman rules) give reliable results for particles with Rayleigh inclusions only.

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“…The changes ofQ pr are important mainly for small heliocentric distances andQ pr is almost constant for distances greater than 5-10 AU. We want to stress that carbonaceous material was taken as an example for which refractive index is known for various temperatures (Jäger et al 2003), while the dependence is not known for materials present in real astronomical dust grains . Table 1 presents several interesting values for carbonaceous particles.…”

Section: Radiation and Motion Of A Sphere Around The Sunmentioning

confidence: 99%

Poynting-Robertson effect and perihelion motion

Klačka

Kocifaj

Pástor

et al. 2006

A&A

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The effect of stellar electromagnetic radiation on the motion of homogeneous spherical dust particles, the Poynting-Robertson (P-R) effect, is investigated. The effect already produces a shift of pericenter/perihelion in the accuracy to the first order in u/c, where u is velocity of the particle with respect to the source of radiation and c is the speed of light. The advancement of pericenter occurs due to the fact that the P-R effect depends on radiation pressure efficiency factor Q pr , which is a function of optical properties of the particle. The particle orbiting a star moves in various distances from the star and the particle optical properties may vary with the distance, as they are functions of temperature.

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A database of optical constants of cosmic dust analogs

Cited by 48 publications

References 7 publications

First Satellite Observations of Meteoric Smoke in the Middle Atmosphere

First Satellite Observations of Meteoric Smoke in the Middle Atmosphere

Modelling the optical properties of composite and porous interstellar grains

Poynting-Robertson effect and perihelion motion

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