کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5430314 | 1508713 | 2007 | 14 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Scattering of electromagnetic waves by charged spheres and some physical consequences Scattering of electromagnetic waves by charged spheres and some physical consequences](/preview/png/5430314.png)
Effect of electromagnetic radiation scattering on homogeneous spherical dust particle which carries excess surface electric charge is investigated. Numerical calculations are presented for the cases of (i) charged spherical particles present in the interplanetary space of the Solar System, and (ii) charged water droplets and ice grains in the Earth's atmosphere. The results show that the surface charge may influence optical properties of very small particles with size parameter x less than 0.01 (astronomical materials like amorphous carbon and silicate are affected also at xâ0.03). Slightly absorbing charged particles may attenuate the electromagnetic radiation more than 10 times efficiently than equivalent non-charged particles. The effect of temperature on efficiency factors for scattering Qsca, absorption Qabs, and radiation pressure Qpr is evaluated for astronomical amorphous carbon, as cosmic dust particles may undergo large temperature changes during their motion in the circumstellar regions. The ratios Qxcharged/Qxneutral (for x=abs,ext, or pr) increase with decreasing grain temperature.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 106, Issues 1â3, JulyâAugust 2007, Pages 170-183