Solar wind pressure on interplanetary dust

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Interplanetary Dust, Poynting-Robertson Effect, Radiation Pressure, Solar Wind, Equations Of Motion, Grain Boundaries, Particle Motion, Pressure Effects, Radiation Effects, Solar Activity Effects, Velocity Distribution, Wind Effects, Wind Pressure, Cosmic Dust, Solar Wind, Pressure, Data, Bombardment, Sputtering, Flow, Velocity, Particles, Water, Obsidian, Radiation, Ice, Magnetite, Mathematical Models, Poynting-Robertson Effect, Solar Radiation, Grains

Scientific paper

The pseudo-Poynting-Robertson effect on an interplanetary grain due to solar wind bombardments is examined with careful consideration for sputtering of a grain and for the velocity dispersion of the solar wind particles. It is found that for water-ice and obsidian grains with radii in the range 0.01-100 micrometers, the retarding force due to solar wind is stronger than, and of the same order as, respectively, that due to solar radiation. On the other hand, for magnetite this drag force is always less than that due to solar radiation. In addition, since the wind flow generally comes from the east of the sun, a grain in a prograde orbit suffers a larger retarding force compared with a grain in a retrograde orbit.

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