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31.
K. Haijima K.G. Tanaka M. Fujimoto I. Shinohara 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(10):1643-1648
Recent two-dimensional (2-D) particle-in-cell (PIC) simulations have shown that there is a critical thickness of a current sheet, above which no significant saturation amplitude of the 2-D tearing (TI) mode can be expected. Here, we have introduced the initial electron temperature anisotropy (αe0 = Te⊥/Te|| > 1), which is known to raise significantly the linear growth rates, and inspected if αe0 > 1 can change the saturation level of the TI in a super-critical current sheet. Varying αe0 and D (D: the current sheet half-thickness) systematically, we have found that while αe0 boosts up the linear growth rate in both sub- and super-critical current sheets, macroscopic effects are obtained only in sub-critical current sheets, that is, energy transfer from the fastest growing short wavelength modes to longer wavelength modes are available only in the sub-critical regime. Since the critical thickness is a fraction of the ion inertial length, the tearing mode assisted by the electron temperature anisotropy alone, despite its significant boost in the linear growth rate, cannot be the agent for reconnection triggering in a current sheet of ion-scale thickness. 相似文献
32.
M. Kato S. SasakiK. Tanaka Y. IijimaY. Takizawa 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008
The Japanese lunar mission SELENE (SELenological and ENgineering Explorer) has been in development to target launch scheduled 2007 summer by H-IIA rocket. The SELENE is starting final integration test after SAR (System Acceptance Review), SRR (System Reliability Review) and instrument environment test. The SELENE is a remote-sensing mission orbiting 100 km altitude of the Moon for nominal one year and extended some months to collect the data for studying the origin and evolution of the Moon. Fourteen instruments and experiment systems are preparing for studies of the Moon, in the Moon, and from the Moon; global element and mineral compositions, topological structure, gravity field of whole moon, and electromagnetic and particle environment of the Moon. The new data center SOAC (SELENE Operation and data Analysis Center) are completed to construct in JAXA Sagamihara campus, and end-to-end test will be carried out between SOAC and data downlink stations. 相似文献
33.
Koji Imai Makoto Suzuki Chikako Takahashi 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2010
We present a calculation of the accuracy and speed of the Voigt function of various algorithms (Armstrong (1967), Hui et al. (1978), Humlicek (1982) and improved version of Kuntz (1997) developed in this study) for making the faster and higher accuracy forward model required for the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) Level 2 (L2) data processing system. 相似文献
34.
H. Shimazu K. Kitamura T. Tanaka S. Fujita M.S. Nakamura T. Obara 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,42(9):1504-1509
We have developed a real-time global MHD (magnetohydrodynamics) simulation of the solar wind interaction with the earth’s magnetosphere. By adopting the real-time solar wind parameters and interplanetary magnetic field (IMF) observed routinely by the ACE (Advanced Composition Explorer) spacecraft, responses of the magnetosphere are calculated with MHD code. The simulation is carried out routinely on the super computer system at National Institute of Information and Communications Technology (NICT), Japan. The visualized images of the magnetic field lines around the earth, pressure distribution on the meridian plane, and the conductivity of the polar ionosphere, can be referred to on the web site (http://www2.nict.go.jp/y/y223/simulation/realtime/).The results show that various magnetospheric activities are almost reproduced qualitatively. They also give us information how geomagnetic disturbances develop in the magnetosphere in relation with the ionosphere. From the viewpoint of space weather, the real-time simulation helps us to understand the whole image in the current condition of the magnetosphere. To evaluate the simulation results, we compare the AE indices derived from the simulation and observations. The simulation and observation agree well for quiet days and isolated substorm cases in general. 相似文献
35.
J Koike T Oshima K A Koike H Taguchi R Tanaka K Nishimura M Miyaji 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1992,12(4):271-274
In connection with planetary quarantine, we have been studying the survival rates of nine species of terrestrial microorganisms (viruses, bacteria, yeasts, fungi, etc.) under simulated interstellar conditions. If common terrestrial microorganisms cannot survive in space even for short periods, we can greatly reduce expenditure for sterilizing space probes. The interstellar environment in the solar system has been simulated by low temperature, high vacuum (77 k, 4 x 10(-6) torr), and protons irradiation from a Van de Graaff generator. After exposure to a barrage of protons corresponding to about 250 years of irradiation in solar space, Tobacco mosaic virus, Bacillus subtilis spores, Aspergillus niger spores and Clostridiun mangenoti spores showed survival rates of 82%, 45%, 28%, and 25%, respectively. Furthermore. pathogenic Candida albicans showed 7% survival after irradiation corresponding to about 60 years in space. 相似文献
36.
Y. Saito I. Iijima Y. Matsuzaka K. Matsushima S. Tanaka K. Kajiwara S. Shimadu 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2014
The essential reason of the lobed-pumpkin shaped super-pressure balloon to withstand against the high pressure is that the local curvature of the balloon film is kept small. Recently, it has been found that the small local curvature can also be obtained if the balloon is covered by a diamond-shaped net with a vertically elongated shape. The development of the super-pressure balloon using this method was started from a 3-m balloon with a polyethylene film covered by a net using Kevlar ropes. The ground inflation test showed the expected high burst pressure. Then, a 6-m and a 12-m balloon using a polyethylene film and a net using the Vectran were developed and stable deployment was checked through the ground inflation tests. The flight test of a 3000 m3 balloon was performed in 2013 and shown to resist a pressure of at least 400 Pa. In the future, after testing a new design to relax a possible stress concentration around the polar area, test flights of scaled balloons will be performed gradually enlarging their size. The goal is to launch a 300,000 m3 super-pressure balloon. 相似文献
37.
Hideo HANADA Seiitsu TSURUTA Kazuyoshi ASARI Hiroshi ARAKI Hirotomo NODA Shingo KASHIMA Ken-ichi FUNAZAKI Fuyuhiko KIKUCHI Koji MATSUMOTO Yusuke KONO Hiroo KUNIMORI Sho SASAKI 《深空探测学报》2014,1(3):200-204
使用面包板模型和仿真方法,在实验室内研究月球指向就位测量望远镜(ILOM)的基本特征,如望远镜星像中心点位置精度、温度效应、倾斜以及地面震动的影响。使用这个技术预期在月球表面观测月球自转时可以达到1ms的精度。将在地面上开展测试验证观测以全面评价达到优于0.1″观测精度目标所需条件和特征。 相似文献
38.
Akihiro Doi Yusuke Kono Kimihiro Kimura Satomi Nakahara Tomoaki Oyama Nozomi Okada Yasutaka Satou Kazuyoshi Yamashita Naoko Matsumoto Mitsuhisa Baba Daisuke Yasuda Shunsaku Suzuki Yutaka Hasegawa Mareki Honma Hiroaki Tanaka Kosei Ishimura Yasuhiro Murata Reiho Shimomukai Shoko Koyama 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2019,63(1):779-793
The balloon-borne very long baseline interferometry (VLBI) experiment is a technical feasibility study for performing radio interferometry in the stratosphere. The flight model has been developed. A balloon-borne VLBI station will be launched to establish interferometric fringes with ground-based VLBI stations distributed over the Japanese islands at an observing frequency of approximately 20?GHz as the first step. This paper describes the system design and development of a series of observing instruments and bus systems. In addition to the advantages of avoiding the atmospheric effects of absorption and fluctuation in high frequency radio observation, the mobility of a station can improve the sampling coverage (“uv-coverage”) by increasing the number of baselines by the number of ground-based counterparts for each observation day. This benefit cannot be obtained with conventional arrays that solely comprise ground-based stations. The balloon-borne VLBI can contribute to a future progress of research fields such as black holes by direct imaging. 相似文献
39.
This paper introduces five useful coordinate systems to optimize the apogee motor firing of a geostationary satellite. This optimization minimizes the propellant consumption for station acquisition manoeuvres. The coordinate systems used for this purpose must depict the optimization parameters together with the propellant consumption. In order to get the propellant consumption, some relations between parameters are derived and the equipropellant lines (planes) are drawn in the coordinate systems. These coordinate systems are used not only for the optimization of the apogee motor firing but also for the optimization of the station acquisition strategy, the transfer orbit setting and the apogee motor sizing. 相似文献
40.
T. Takakura K. Tanaka E. Hiei 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1984,4(7):143-152
High temperature phenomena occurring in solar flares are reviewed based on hard X-ray images and spectral analyses of highly ionized iron lines observed aboard the Hinotori spacecraft.Five basic flare components are proposed, i.e., impulsive (I), gradual hard (GH), thermal (T), quasi thermal (QT) and hot thermal (HT) components. A flare shows some combination of the five components. Energy release and transport for each component would give a lot of variety to the hard X-ray image, spectrum and time history of X-rays. 相似文献