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2 results on '"Komiyama, Tatsuto"'

1. In-situ space environment measurement of near earth and SEDA

Author

Goka, Tateo, Matsumoto, Haruhisa, Koga, Kiyokazu, Koshiishi, Hideki, Kimoto, Yugo, Sasaki, Yasutomo, and Komiyama, Tatsuto

Subjects
space radiation, spacecraft charging, geostationary orbit, 放射線帯, 宇宙機設計, 衛星搭載機器, 宇宙機帯電, aerospace environment, radiation belt, satellite-borne instrument, satellite observation, 宇宙放射, 航空宇宙環境, 衛星観測, 宇宙線, 静止軌道, cosmic ray, spacecraft design
Abstract

The current status of measuring radiation using JAXA satellites is reviewed. Starting with Engineering Test Satellite-5 (ETS-5; KIKU-5 in Japanese) in 1987, efforts to conduct radiation measurements in space have continued using almost all Japan Aerospace Exploration Agency (JAXA formerly NASDA) satellites (ETS-6 (Engineering Test Satellite-6: KIKU-6), ADEOS (ADvanced Earth Observing Satellite: Midori), ADEOS-2 (ADvanced Earth Observing Satellite-2: Midori-2), MDS-1 (Mission Demonstration test Satellite-1: Tsubasa), DRTS (Data Relay Test Satellite: KODAMA)(ongoing) and ETS-8 (Engineering Test Satellite-8: KIKU No.8)(ongoing), and ALOS (Advanced Land Observing Satellite: Daichi)(ongoing)), in Geostationary Orbit (GEO), Geostationary-Transfer Orbit (GTO), and Low-Earth Orbit (LEO). Electrons, protons, alpha particles, and heavy ions have been the main objects of study. Future plans for radiation monitoring in JAXA, including GOSAT (Greenhouse gases Observing SATellite), Jason-2 (in collaboration with CNES), and ISS (International Space Station)/JEM (Japanese Experiment Module)/Exposure Facility/SEDA-AP (Space Environment Data Acquisition equipment-Attached Payload), are presented., 資料番号: AA0063997004, レポート番号: JAXA-SP-07-030

Published
2008

2. Calculation of radiation exposure on the moon surface by using PHITS

Author

Komiyama, Tatsuto and Matsumoto, Haruhisa

Subjects
solar radiation, 放射線遮蔽, radiation exposure, 月探査, 2次中性子, 放射線輸送コード, secondary neutron, 有人月面基地, 数値シミュレーション, Monte Carlo method, lunar exploration, radiation transportation code, モンテカルロ法, computer program, numerical simulation, 太陽放射, 宇宙線, 計算機プログラム, 放射線被爆, manned lunar base, cosmic ray, radiation shielding
Abstract

JAXA published the 'JAXA Vision-JAXA 2025-' in March 2005, in which JAXA proposed to prepare for the establishment of a human lunar base. To follow the vision, JAXA started several studies. Recently, in order to contribute the studies, we calculated radiation exposure dose on the lunar surface by using a radiation transportation code, PHITS, developed by Koji Niita (Research organization for Information Science and Technology) et. al. As a result of the calculation, the effective dose equivalent under 10 g/sq cm shielding in the solar minimum condition is around 0.55 mSv/day and one in the solar flare worst day condition is around 70 mSv/day. On the other hand, the effective dose without shielding in the solar minimum condition is around 0.71 mSv/day and one in the solar flare worst day condition is around 4,000 mSv/day. This suggests that the shielding design and the radiation exposure management will be very important for the lunar base design., 資料番号: AA0049500034, レポート番号: JAXA-SP-06-006

Published
2006

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