@article{oai:jaxa.repo.nii.ac.jp:00033110, author = {前沢, 洌 and MAEZAWA, K.}, journal = {宇宙科学研究所報告. 特集: 宇宙観測研究報告}, month = {Mar}, note = {Mars and Venus are very different from other planets of the solar system in that their intrinsic magnetic field is minimal and cannot fully withstand the solar wind pressure. Therefore, the planetary ionospheres may directly interact with the solar wind plasma. This fact, established for Venus and to be confirmed for Mars, has made these planets interesting targets for future planetary missions. In this article, a brief review is presented on what we have learned from previous missions on these unique planetary environments. Scientific returns from the future missions are discussed with emphasis on the value of comparisons of diverse magnetospheres. This approach is the key to the ultimate understanding of the interaction between the solar wind and planetary magnetospheres., 資料番号: SA0166984000}, pages = {103--110}, title = {地球型惑星探査の研究課題}, volume = {28}, year = {1991} }