@inproceedings{oai:jaxa.repo.nii.ac.jp:00020449,
 author = {三浦, 均 and 保田, 誠司 and 中本, 泰史 and Miura, Hitoshi and Yasuda, Seiji and Nakamoto, Taishi},
 book = {第40回月・惑星シンポジウム, Proceedings of the 40th ISAS Lunar and Planetary Symposium},
 month = {Jul},
 note = {We proposed a new scenario for compound chondrule formation in the framework of the shock-wave heating model. We modeled the disruption of molten cm-sized parent dust particle exposed to high-velocity gas flow in order to estimate the efficiency of mutual collisions between small fragments assuming that all of them have the same radius. The collision rate (expected collision frequency per unit time per a fragment) is given by R(sub coll) is approximately equal to sigma(sub coll) x n(sub e) x Delta(v), where sigma(sub coll), n(sub e), and Delta(v) are the cross-section of collision, number density, and velocity dispersion of fragments, respectively. We estimated n(sub e) and Delta(v) in our model and obtained the collision frequency F(sub coll) by integrating R(sub coll) over the time t from t = 0 to t = infinity. The predicted collision frequency was approximately 0.1-1 or more in a typical case, which is about one order of magnitude larger than the observational compound fraction. We also examined the shadow effect, which is the effect that the fragments earlier ejected from the parent particle can be kept away from the ambient gas flow because other particles ejected lately block out the flow from upstream. We found that the shadow effect enhances the collision frequency by a several times., 資料番号: AA0063723029},
 pages = {123--127},
 publisher = {宇宙航空研究開発機構宇宙科学研究本部, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)},
 title = {Compound chondrule formation in shocks: Collision frequency between fragments of disrupted molten dust},
 year = {2007}
}