コンドリュール形成温度推定のための浮遊しているHyper cooled meltからの結晶化 : 気相成長

抄録

In order to understand the condition for the formation of typical radial pyroxene and barred olivine chondrules, the crystallization process of Enstatite (MgSiO_3) and Forsterite (Mg_2SiO_4) melt droplets (2〜3 mm, diameter) were observed in-situ. Experiments were performed under microgravity condition, which was realized by the parabolic flight of airplane and under containerless condition which was levitated by supersonic. In the results, both chondrules were crystallized from very large supercooling such as over hypercooling limit ( = AH_f/C_p). It is indicated that chondrules were formed in a very rapid process rather than it was thought previously.