Computer Science
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981esasp.164....3a&link_type=abstract
In ESA The Solar System and its Exploration p 3-10 (SEE N82-26087 16-88)
Computer Science
1
Cosmic Plasma, Planetary Evolution, Solar System, Stellar Evolution, Gravitational Collapse, Interstellar Matter, Plasma Density, Plasma Pinch, Protoplanets, Protostars, Stellar Mass Accretion
Scientific paper
Magnetospheric research and laboratory evidence are used to argue that plasma dominated processes were essential for the evolution of interstellar clouds and of circumsolar cloud up to the transition from the plasma to the planetesimal phase. Interstellar clouds could be formed by electromagnetic contraction which would also increase cloud density, bringing it to the limit of gravitational collapse without recourse to a triggering mechanism. In a dusty plasma cloud, large particles serve as a core around which gaseous components can collapse. The inhomogeneity of the clouds causes them to fragment into stellesimals which accrete into protostars. Planets are formed in a semistationary process by matter from the primeval cloud penetrating a void around the protostar. Satellites are formed similarly. Chemically differentiated small clouds of neutral gas and dust reach the central body via a low plasma density region. The gas is stopped and ionized when it attains the critical velocity. This explains the band structure of the solar system.
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