TY - JOUR AB - We numerically simulate the circular polarization ratio of the radar signal backscattered from a large-grain cometary coma and compare the simulation results with the radar measurements for seven comets. We apply the discrete dipole approximation method and a model of random irregular particles. Our results confirm water ice composition of the cm-sized chunks detected by the NASA Deep Impact space probe in the vicinity of the nucleus of Comet 103P/Hartley 2. The index of the power-law size distribution in this case can be constrained to the range n ≈ 3.3–4.3. For the other considered comets the circular polarization ratio can be reproduced with variations of the power index between 2 and 5. AU - Dogra, Shraddha AU - Grynko, Yevgen AU - Zubko, Evgenij AU - Förstner, Jens ID - 3523 JF - Astronomy & Astrophysics KW - tet_topic_scattering SN - 0004-6361 TI - Radar backscattering from a large-grain cometary coma: numerical simulation VL - 608 ER -