Fig. 1. Real part and imaginary part of refractive index of sand

Fig. 2. Relationship among scattering, absorption and extinction efficiency factors and dust particle size

Fig. 3. Density function of sand size distribution

Fig. 4. Relationship between extinction parameters and wavelength of 1-6 mode sandstorm

Fig. 5. Relationship between extinction parameters and wavelength of mode 7 sandstorm

Fig. 6. Comparison of calculation results based on single scattering and multiple scattering

Fig. 7. Relationship between attenuation rate and wavelength of 7 kinds of modes

Fig. 8. Relationship between attenuation rate and visibility