Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..155h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 155-161.
Astronomy and Astrophysics
Astrophysics
63
Cosmic Dust, Cosmic Plasma, Electrostatic Charge, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Cold Plasmas, Electron Emission, High Temperature Plasmas, Plasma Temperature, Polarization (Charge Separation), Transient Heating
Scientific paper
The electrostatic charge of small dust grains in a plasma in which the temperature varies in time is discussed, pointing out that secondary electron emission might introduce charge separation. If the sign of the charge on small grains is opposite to that on big ones, enhanced coagulation can occur which will affect the size distribution of grains in a plasma. Two scenarios where this process might be relevant are considered: a hot plasma environment with temperature fluctuations and a cold plasma environment with transient heating events. The importance of the enhanced coagulation is uncertain, because the plasma parameters in grain-producing environments such as a molecular cloud or a protoplanetary disk are not known. It is possible, however, that this process is the most efficient mechanism for the growth of grains in the size range of 0.1-500 microns.
Goertz Christoph K.
Horanyi Mihaly
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