@inproceedings{oai:jaxa.repo.nii.ac.jp:00038385,
 author = {高田, 淑子 and Ahrens, Thomas J. and Takata, Toshiko and Ahrens, Thomas J.},
 book = {第28回月・惑星シンポジウム, Proceedings of the 28th ISAS Lunar and Planetary Symposium},
 month = {Dec},
 note = {Magellan Radar images revealed that some small craters are surrounded by radar dark and bright halos extended about 20 times the crater radius preferentially toward the incoming direction. These features are unique to Venus. One possible explanation for the formation of halos is that they are possibly caused by the atmospheric shock wave induced during the meteoroidal passage in the thick Venusian atmosphere. In order to investigate this hypothesis, the degree of surface disturbance induced by the passage of atmospheric bow shock is estimated. The interaction of the paraboloidal bow shock accompanying a spherical object with the planetary surface is modeled and maximum gas particle velocity, dynamic pressure, and degree of saltation and fragmentation of surface pebbles are quantified. Results show that the area of crater radii of 10-17 is affected by the surface disturbance in the case of the impact of a 1 km radius - meteoroid at 20 km/s. The analysis exhibits that the atmospheric shock accompanying with a meteoroidal flight induces pulverization of surface materials and resulted in a radar dark halo. In the area further away from the crater, the degree of pulverization is not enough and blocky surface materials form bright halos., 資料番号: AA0063352018},
 pages = {69--72},
 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 = {Atmospheric effects on cratering on Venus},
 year = {1995}
}