Waseda University Advanced Research Institute for Science and Engineering
Waseda University Advanced Research Institute for Science and Engineering
Waseda University Advanced Research Institute for Science and Engineering
Waseda University Advanced Research Institute for Science and Engineering
出版者
宇宙航空研究開発機構宇宙科学研究本部
出版者（英）
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
雑誌名
第37回月・惑星シンポジウム
雑誌名(英)
Proceedings of the 37th ISAS Lunar and Planetary Symposium
ページ
111 - 114
発行年
2004-02
抄録（英）
A possible mechanism for the formation of the source composition of cosmic rays is proposed by taking into account the condensation process occurring in the interstellar space. This process may have produced the overabundance of heavy and ultra heavy nuclei in the source composition as compared with the chemical composition of the sun. Since the chemical composition of galactic cosmic ray source is similar to that of meteorite as classified as C2, that of galactic cosmic rays was compared with that of silicon carbide of presolar grains. It is found that both the iron isotope ratios and chemical composition of ultra heavy cosmic rays are similar to those in presolar grains. The chemical composition of presolar grains and meteorites may give a clue to search for the birth place of cosmic rays in the interstellar space.
The source and acceleration of cosmic rays as viewed from the nature of the interstellar dust grains
