Millimeter-wave experiments for cometary space missions

Details Millimeter-wave experiments for cometary space missions Millimeter-wave experiments for cometary space missions

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...47..434h&link_type=abstract

(International Astronomical Union and American Astronomical Society, Colloquium on Comets: Gases, Ices, Grains, and Plasma, 61st

Astronomy and Astrophysics

Astronomy

1

Comet Nuclei, Land Ice, Microwave Spectra, Millimeter Waves, Snow Cover, Space Missions, Astronomical Models, Brightness Temperature, Line Spectra, Radiative Transfer, Millimeter Waves, Wavelengths, Experiments, Brightness Temperature, Data, Models, Comet Nuclei, Layers, Mixing, Water, Ice, Refractory Elements, Grains, Spectrum, Radiative Transfer, Techniques, Equipment, Crust, Comets, Thickness, Temperatures, Gradients, Surface, Boundary Layers, Spectroscopy

Scientific paper

Predicted brightness temperatures, computed by means of radiative transfer techniques adapted from the modeling of terrestrial ice and snow fields, are given for cometary nucleus models consisting of homogeneous layers of water ice and refractory grain mixtures presented as functions of wavelength. The computed millimeter-wave spectra are sensitive to the values of such physically significant nucleus parameters as (1) crust thickness, (2) subsurface temperature gradient, and (3) sublimating surface boundary temperature. Although antenna beam dilution is a major obstacle for ground-based molecular spectral line radio observations of comets, a millimeter-wave radiometer in the vicinity of the comet would be immune to this effect and able to make observations of several candidate parent molecules in the gas phase.

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