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Tenth Conference on Electromagnetic and Light Scattering
June, 17-22, 2007, Bodrum, Turkey

DOI: 10.1615/ICHMT.2007.ConfElectromagLigScat


ISBN Print: 978-1-56700-244-7

Differences in polarimetric properties of cometary jets and circumnucleus halos

pages 257-260
DOI: 10.1615/ICHMT.2007.ConfElectromagLigScat.670
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RÉSUMÉ

Polarimetry of comets reveals significantly higher polarization in jets than in circumnucleus halos. We hypothesize that this difference arises from distinction in the velocity of dust: particles in jets move out of a nucleus much faster than those in a halo and thus we may observe jet particles in the early stage of their evolution when they are large agglomerates of small grains fastened by a certain amount of ice; velocity of particles in a circumnucleus halo is low enough to be observed in the latter stage of evolution when ice already sublimated totally and agglomerates have been disrupted into constituent grains. Using the discrete dipole approximation we study the influence of disruption of agglomerated dust particles due to ice sublimation on their angular dependence of degree of linear polarization. We found that in a wide range of phase angles the linear polarization of agglomerates of three grains comparable to wavelength covered by ice is visibly higher than polarization of independently scattering constituent grains. This supports our interpretation of the polarimetric observations of comets.

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