Possible targeting of particle emission by mechanical stress and penetration of sublimating ice-dust-surfaces

Details Possible targeting of particle emission by mechanical stress and penetration of sublimating ice-dust-surfaces Possible targeting of particle emission by mechanical stress and penetration of sublimating ice-dust-surfaces

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.302..201k&link_type=abstract

In ESA, Physics and Mechanics of Cometary Materials p 201-203 (SEE N90-19989 12-90)

Physics

Comets, Dust, Ice, Particle Collisions, Particle Emission, Penetration, Pressure Effects, Simulation, Comet Nuclei, Cometary Atmospheres, European Space Programs, Experimentation, Low Speed

Scientific paper

Laboratory simulation experiments showed that sublimating surfaces of ice-dust mixtures are unstable against mechanical stress. This instability may be caused by a pressure gradient within the uppermost layers of the simulated cometary surface. Different kinds of stress, such as penetration, pressure change and low velocity particle impact were examined. In every case sudden increase of dust emission activity was observed. Evidence for real comets and possible consequences for the Rosetta mission are discussed.

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