Backscattering and negative polarization of agglomerate particles.
We used the discrete dipole approximation to study the backscattering of agglomerate particles consisting of oblong monomers. We varied the aspect ratio of the monomers from approximately 1 (sphere) to 4, while we kept the total particle volume equivalent to that of an x = 10 sphere for m = 1.59 + i0 and 1.50 + i0 and considered two values of agglomerate packing density: rho = 0.25 and rho = 0.1. We found that these particles do not display a prominent brightness opposition effect but do produce significant negative polarization over a range of near-backscattering angles. Increasing the monomers' aspect ratio can make the negative polarization much more prominent. We have noted also that decreasing m and p can reduce the amplitude of the negative polarization for these particles.
Zubko
Evgenij
E
Institute of Astronomy, Kharkov National University, 35 Sumskaya Street, Kharkov 61022, Ukraine.
Shkuratov
Yuriy
Y
Hart
Matthew
M
Eversole
Jay
J
Videen
Gorden
G