Physics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981cajph..59..897h&link_type=abstract
Canadian Journal of Physics, vol. 59, July 1981, p. 897-901.
Physics
19
Comets, Dynamic Stability, Electrical Resistivity, Electrostatic Charge, Spheroids, Stress Distribution, Astronomical Models, Comet Tails, Grain Boundaries, Space Plasmas, Tensile Strength
Scientific paper
Electrostatic disruption of elongated parent grains following sudden charging to high electrostatic potentials is proposed as a specific mechanism for the appearance of striae or pseudosynchronic bands which have been observed in several comets. The polar and equatorial electrostatic tension for axis ratios between 0.01 and 1000 are calculated, and the polar pressure is found to be larger than the equatorial pressure for prolate spheroids. The electrostatic polar pressure profile along the polar axis for prolate spheroids is calculated, and the pressure is found to increase monotonically from a minimum at the center to a maxima at the ends. This indicates that as a prolate spheroid of uniform tensile strength is charged up, it will continue to chip off at the ends when the electrostatic pressure there exceeds the uniform tensile strength of the grain. The result can be a prolate grain or a grain which continues chipping until it explodes.
Hill Richard J.
Mendis Asoka D.
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