Laboratory studies on time dependent particle emission from cometary analogues

Details Laboratory studies on time dependent particle emission from cometary analogues Laboratory studies on time dependent particle emission from cometary analogues

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esasp.315..197k&link_type=abstract

In ESA, Formation of Stars and Planets, and the Evolution of the Solar System p 197-201 (SEE N91-18922 10-90)

Astronomy and Astrophysics

Astronomy

Cometary Atmospheres, Comets, Cosmic Dust, Particle Emission, Time Dependence, Astronomical Models, Comet Heads, Comet Tails, Ice, Mathematical Models, Solar Constant

Scientific paper

Time dependent behavior of ice/dust/particle emission from cometary analog surfaces under space conditions is experimentally studied by different instrumental techniques in the comet simulation project. Results from time resolved collector measurements, signals from evaporating particles and piezoceramic acoustic detectors are correlated with the heating of the sample surface by irradiation with 1.16 solar constants. It is shown that emission of almost pure ice particles has its highest activity in the first moments of irradiation. In the following 145 minutes it rapidly decreases. When the surface temperature has reached about 300 K, the emission of mineral ice particles starts. Highest activity is measured after 30 to 50 minutes of irradiation. The decay of this activity is much slower than that of the ice particles. The emission of different particles and increasing surface temperature are correlated with the formation of a dust mantle.

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