THE THERMAL DESTRUCTION OF SOLIDS NEAR THE SUN


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Abstract

We consider the thermal evolution of both icy and non-icy solids moving in highly eccentric orbits using an analytical solution of the heat diffusion equation.The thermal stresses which arise inside and at the surface of solids can exceed by several orders of magnitude the tidal stresses in the neighbourhood of the Sun for all material considered. This means that thermal disintegration is the most important factor in the evolution of cometary and meteorite-like bodies. This problem may be directly connected with the origin of the variable part of the infrared radiation excess in the F-corona observed at 4Rôand 9Rôfrom the Sun.The possible scenario of the disintegration of the distant solids due to the thermal stresses is also given.

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