Possible triggering of particle emission by mechanical stress and penetration of sublimating ice-dust-surfaces.
Laboratory simulation experiments have shown 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 a 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.
Physics and Mechanics of Cometary Materials
- Pub Date:
- December 1989
- Particle Collisions;
- Particle Emission;
- Pressure Effects;
- Comet Nuclei;
- Cometary Atmospheres;
- European Space Programs;
- Low Speed;
- Cometary Dust: Laboratory Simulations;
- Cometary Nuclei: Particle Escape