Role of small grains in the visible polarization of Comet Halley

Details Role of small grains in the visible polarization of Comet Halley Role of small grains in the visible polarization of Comet Halley

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b..59m&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 59-63 (SEE N87

Physics

2

Cosmic Dust, Halley'S Comet, Polarimetry, Polarization (Waves), Ice, Phase Shift, Space Observations (From Earth)

Scientific paper

Visible polarimetry of comet Halley over the phase angle α from 1°.6 to 64°.4 has been made by using the eight-channels polarimeter. Negative values of the polarization p in α < 20° and linearly increase of p with α were found. A slightly increase of p with wavelength is likely to exist. Observed α-dependence of p leads to average optical constants (m = n-imk) of grain materials; n = 1.39±0.01 and k = 0.035±0.004, where the grains have the size spectrum reported by the Vega mission. Furthermore model calculations suggest that small grains with radii s < 1 μm play essential role in the polarization of comets.

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