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Dust emission of mineral/ice mixtures: residue structure and dynamical parameters
Author(s) -
Thiel K.,
Kölzer G.,
Kohl H.
Publication year - 1991
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/90gl02590
Subject(s) - particle (ecology) , particle size , ice core , atmospheric sciences , physics , environmental science , materials science , geology , climatology , oceanography , paleontology
In a series of experiments the particle emission from ice/dust mixtures under insolation at space conditions was investigated using an array of particle collectors and Piezo impact detectors. The dust data provide an estimate of the ratio of ice containing to ice free particles for different size ranges, indicating a decrease in the frequency of ice free particles with increasing particle size. The measurement of the main dynamical parameters of the particle emission reveals a significant interrelation of particle size, starting angle and velocity of the emission process. The near surface particle stream exhibits an internal structure of a low‐speed central core of large grains superimposed by a high‐speed background of small grains. Possible implications for the dynamics of a dust jet emanating from a comet nucleus are discussed.