Interplanetary Dust Particles Optical Properties: A Clue to Cometary Dust Structure?

Details Interplanetary Dust Particles Optical Properties: A Clue to Cometary Dust Structure? Interplanetary Dust Particles Optical Properties: A Clue to Cometary Dust Structure?

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997arcn.rept..239l&link_type=abstract

Analysis of Returned Comet Nucleus Samples, Proceedings of a Workshop held at Milpitas, California, 16-18 January, 1989. Compil

Computer Science

Optical Properties, Comets, Brightness, Zodiacal Light, Optical Polarization, Zodiacal Dust, Albedo, Ecliptic, Light Scattering, Line Of Sight, Surface Properties, Reflectance, Thermal Emission, Interplanetary Dust

Scientific paper

Both the solar light scattered by interplanetary dust particles and the thermal plane emission from these particles have been extensively observed. Techniques of inversion of the line-of-sight brightness allow to derive local optical properties of the interplanetary dust. In the ecliptic plane near 1 au, the heliocentric gradients of local polarization, temperature, and albedo are found to be of the order, respectively, of 0.8, -0.3, and -0.7. Towards the ecliptic pole, the local polarization is found to be much smaller than in the ecliptic at the same solar distance. Also the temperature decreases faster with increasing distance than it does in the ecliptic, when an increase in bulk albedo. Some optical properties of the dust particles may be inferred from these results. They are consistent with a scenario of evolution of dark fluffy cometary grains evaporating as they spiral towards the Sun.

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