Study on the Differential Scattered Section of a Moving spheroidal Interstellar Dust

The laser scattering characteristic of spheroidal interstellar dust moving with a high speed is investigated numerically. The coordinate and vector transformations have been presented to establish a theoretic basis for studying the laser scattering of a moving spheroidal interstellar dust. The laser differential scattered section (DSS) of a moving spheroidal interstellar dust is explained by the electric and magnetic field from Mie scattering theory in detail. Assuming the laser length of 2.2 mum, we had computed the ratio of the laser DSS of the moving spheroidal interstellar dust to that of the static interstellar dust, which changes with radii and scattering angles of the particle. The numerical results showed that the laser DSS of the moving spherical particle is tightly connected with its speed and scattering zenith angle. If a spheroidal interstellar dust moves with high speed, it has a strong forward scattering .The speed of the moving spheroidal interstellar dust is higher, the laser DSS value is larger. If a spheroidal interstellar dust moves with a low speed, the Influence of a high-speed spheroidal interstellar dust´s movement on its scattering characteristics will be neglected.