Showing papers by "N. C. Wickramasinghe published in 1992"
TL;DR: For metallic cylinders with a conductivity σ=1018 s−1 and length to radius ratios in the range 3×104 to 3×105 the Mie-type solution for the absorption coefficient merges smoothly, with a domain of overlap, into the Rayleigh solution as discussed by the authors.
Abstract: For metallic cylinders with a conductivity σ=1018 s−1 and length to radius ratios in the range 3×104 to 3×105 the Mie-type solution for the absorption coefficient merges smoothly, with a domain of overlap, into the Rayleigh solution. The absorption effects are then shown to be rigorously determined at all wavelengths. A cosmological application is briefly discussed.
10 citations
Journal Article•
TL;DR: In this article, Flooding of a cometary crater, resulting from the freezing of an interior lake that cracks the surface ice via expansion forces, plausibly produces the observed coma of ice particles.
Abstract: Last year's spectacular outburst of Halley's comet, brightening by 300 times due to a 10 5 km coma of particles, was not expected by conventional cometary experts. Explanations based on an asteroid collision, or a solar flare, or ice phase change are unconvincing. Flooding of a cometary crater, resulting from the freezing of an interior lake that cracks the surface ice via expansion forces, plausibly produces the observed coma of ice particles
5 citations
TL;DR: In this article, the presence of iron whiskers in the cosmic microwave background was found to be consistent with recently observed fluctuations in the intensity of this background, which is consistent with recent observations.
Abstract: Thermalisation models of the cosmic microwave background which invoke the presence of iron whiskers are shown to be generally consistent with recently observed fluctuations in the intensity of this background.
5 citations
TL;DR: Subsurface lakes on the Europa model, though insulated by some metres of ice, would require a trigger (perhaps meteorite impact and energy source) to initiate and maintain a suitable-habitat on short period comets.
4 citations
TL;DR: In this paper, it was shown that spherical graphite particles have no physical or astronomical relevance and were excluded as a major component of interstellar grains because their ultraviolet extinction peaks occur at wavelengths longward of 2700 A.
Abstract: Graphite flakes are excluded as a major component of interstellar grains because their ultraviolet extinction peaks occur at wavelengths longward of 2700 A. Mie calculations for spherical graphite particles are shown to have no physical or astronomical relevance.
3 citations