Optical properties of fluffy aggregates as analogue of interplanetary dust particles

R. Nakamura, Hajime Okamoto

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Based on the appearance of chondritic porous aggregates collected from stratosphere, we have modeled interplanetary dust particles as fluffy aggregates consisting of submicron-sized spherical monomers. The optical properties are calculated by a modified version of the discrete dipole approximation where the dipole polarizability is determined by the first term of scattering coefficient in the Mie theory. The accuracy of our calculations is confirmed through the comparison with the rigorous solutions for cluster of spherical monomers. It is found that fluffy aggregates have larger cross sections and less resonant structures in the scattering profiles in comparison with the volume-equivalent sphere. Our model results in consistent behaviors with the observation of zodiacal light, i.e., slow rise towards the backward direction and negative polarization between the scattering angles 160° ≤ θ ≤ 180°. For two sets of optical constants of dielectric materials, these properties are not sensitive to the size of an aggregate as long as the monomer size is smaller than the incident wavelength.

Original languageEnglish
Pages (from-to)1209-1212
Number of pages4
JournalAdvances in Space Research
Volume23
Issue number7
DOIs
Publication statusPublished - Jan 1 1999

Fingerprint

interplanetary dust
optical property
Particles (particulate matter)
Dust
Optical properties
analogs
optical properties
monomers
Monomers
scattering
Scattering
zodiacal light
dipoles
Slow light
Mie theory
Upper atmosphere
Optical constants
scattering coefficients
Mie scattering
stratosphere

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

Cite this

Optical properties of fluffy aggregates as analogue of interplanetary dust particles. / Nakamura, R.; Okamoto, Hajime.

In: Advances in Space Research, Vol. 23, No. 7, 01.01.1999, p. 1209-1212.

Research output: Contribution to journalArticle

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