Model Calculations of Near Solar Dust Properties

I. Mann, H. Ishimoto, H. Okamoto, T. Mukai
1996 International Astronomical Union Colloquium  
AbstractWe discuss efforts to explain the dust distribution, as it was derived from the F-coronal brightness, mainly how to explain a constant number density near the Sun. It is shown that silicate particles have temperatures below the blackbody temperature if the impurity from absorbing material amounts to less than 0.1% in volume. This effect is especially significant for porous particles and may explain why particles can approach to less than 3 R⊙ from the Sun. Another effect may arise from
more » ... articles on high eccentricity orbits and from the influence of collisional fragments. Whereas on the one hand heat resistant silicate particles may cause a stable dust cloud in the solar vicinity, on the other hand dynamical effects may cause a variation of the number density in the corona in short time scales.
doi:10.1017/s0252921100501857 fatcat:dwlqr7hg5re7zb2yvgmpz5nfty