Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.176..163m&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 176, no. 1, Feb. 1991, p. 163-167.
Astronomy and Astrophysics
Astrophysics
18
Cosmic Dust, Emission Spectra, Interstellar Matter, Solar System Evolution, Electrostatics, Field Emission, Plasma Temperature, Plasma-Particle Interactions
Scientific paper
The role of field emission in mitigating the process of electrostatic disruption of charged cosmic dust grains is discussed. It is shown that this process prevents the disruption of even the smallest grains independent of the plasma environment if the tensile strength Ft of such grains is greater than about 3.6 x 10 to the 7th dynes/sq cm. On the other hand, if such grains are very fragile (i.e., F is equal to or greater than 10 to the 6th dynes/sq cm, as in 'cometary' grains) even field emission cannot always prevent their electrostatic disruption. In this case it is required that the magnitude of the potential of the grains is 0.15 V or less, which places stringent upper limits on the ambient plasma temperature T. For pure hydrogen and pure oxygen plasmas, T is equal to or less than 700 K and 460 K, respectively.
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