Interaction of interplanetary dust grains with the solar radiation field

Computer Science – Numerical Analysis

Scientific paper

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Interplanetary Dust, Mie Scattering, Solar Corona, Solar Radiation, Gravitational Effects, Ice, Microparticles, Numerical Analysis, Radiation Pressure, Silicates, Temperature Distribution

Scientific paper

The interaction of interplanetary dust grains with the solar radiation field is investigated for micronic and submicronic spheres of quartz, obsidian, andesite, ice, and iron. The dependence of the complex indices of refraction on wavelength was taken into account using Mie theory to obtain the efficiency factors for absorption and radiation pressure. The temperature distributions differ markedly from past results, and show that silicate grains can come very close to the sun, thus justifying the existence of a dusty component of the solar corona up to approximately 2 solar radii. Improved vapor pressure formulas yield increased lifetimes for interplanetary grains. It is shown that the onset of rapid destruction by sublimation is extremely sudden and has a well-defined location which depends upon the absorption character of the grains' material. The radiation pressure force never exceeds the gravitational force for silicates and ice.

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