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Laboratory Results on Polarization Properties of Elongated Particles and Comparisons to Dust in the Tail of Comet Ikeya-Seki (1965 VIII)

Published online by Cambridge University Press:  12 April 2016

Bo.Å.S. Gustafson
Bo.Å.S. Gustafson*
Affiliation:
Space Astronomy Laboratory, University of Florida, 1810 NW 6th Street Gainesville, Florida 32609, U.S.A.

Abstract

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Data obtained through microwave analog measurements are used to compare optical polarization characteristics of silicate particles ranging in shape from spheroids and cylinders to chains of spheres. It is confirmed that the dependence of the degree of polarization on scattering angle is a powerful indicator of particle shape. The reversal and steep gradient in the degree of polarization found by Weinberg and Beeson (1976a,b) in the dust tail of comet Ikeya-Seki (1965 VIII) is suggestive of laboratory measurements corresponding to 1.6 μm long, 0.4 μm in diameter silicate cylinders.

Type
IV. Optical Studies of Dust
Information
International Astronomical Union Colloquium , Volume 85: Properties and Interactions of Interplanetary Dust , 1985 , pp. 227 - 230
Copyright
Copyright © Reidel 1985

References

Greenberg, J.M., 1978, ‘Interstellar dust’, Cosmic Dust, (ed. McDonell, J.A.M.), John Wiley and Sons, New York, 187.Google Scholar
Krishna Swamy, K.S., 1978, ‘On the observed polarization of comet Ikeya-Seki (1965 VIII)’, Astrophys. Space Sci., 57, 491.Google Scholar
Schaefer, R.W., 1980, ‘Calculations of the light scattered by randomly oriented ensembles of spheroids of size comparable to the wavelength’, Ph.D. Thesis, State U. New York at Albany.Google Scholar
Schuerman, D.W., 1980, ‘The microwave analog facility at SUNYA: capabilities and current programs’, Light Scattering by Irregularly Shaped Particles, (ed. Schuerman, D.W.), Plenum Press, New York and London, 227.CrossRefGoogle Scholar
Schuerman, D.W., Wang, R.T., Gustafson, B.Å.S., and Schaefer, R.W., 1981, ‘A systematic study of light scattering: I. Particle shape’, Applied Optics, 20, 4039.Google Scholar
Sekanina, Z., and Farrell, T.A., 1980, ‘Evidence for fragmentation of strongly nonspherical dust particles in the tail of Comet West 1976 VI’, in Proc. IAU Symposium No. 90, Solid Particles in the Solar System, (eds. Hallidav, I. and McIntosh, B.A.), Ottawa, 267.CrossRefGoogle Scholar
Wang, R.T., and Gustafson, B.Å.S., 1983, ‘Angular scattering and polarization by randomly oriented dumbbells and chains of spheres, in Proc. 1983 CSL Scientific Conference on Obscuration and Aerosol Research’, U.S. Army, Aberdeen, MD.Google Scholar
Weinberg, J.L., and Beeson, D.E., 1976a, ‘Polarization reversal in the tail of comet Ikeya-Seki (1965 VIII)’, Astron. Astrophys. 48, 151.Google Scholar
Weinberg, J.L., and Beeson, D.E., 1976b, ‘Photoelectric polarimetry of the tail of comet Ikeya-Seki (1965 VIII)’, in Proc. IAU Symposium No. 25, The Study of Comets, (ed. Donn, B. et al.), NASA SP-393.Google Scholar
Zerull, R.H., 1985, ‘Laboratory investigation and optical properties of grains’, in Proc. IAU Colloquium No. 85, Properties and Interactions of Interplanetary Dust, this volume.Google Scholar