Abstract
This paper presents two problems related to the ejection of particles from the surface of the cometary nucleus. The first problem is related to the phase of quiet sublimation. This part of the paper discusses the influence of the water ice sublimation flux on the size of particles that are lifted into the coma. In these considerations, three formulas were used to describe the water ice sublimation flux. The calculations show that the size of the particle lifted into the coma depends on its density and the sublimation flux of water ice. The second mechanism is related to the cometary outburst phase. In this part of the paper, it was proposed that the cometary outburst as a high-energy process may significantly contribute to explaining the presence of small particles in the coma. Based on the calculations performed, it was shown that the dimensions of these particles depend on the adopted value of the power index in the power law. Based on the considerations presented in this paper, the presence of both large and fine dust particles observed in the coma during the Rosetta mission can be explained.
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