排序方式: 共有37条查询结果,搜索用时 263 毫秒
11.
E.S. Seo H.S. Ahn P. Allison M.G. Bagliesi L. Barbier A. Barrau R. Bazer-Bachi J.J. Beatty G. Bigongiari P. Boyle T.J. Brandt M. Buénerd J.T. Childers N.B. Conklin S. Coutu L. Derome M.A. DuVernois O. Ganel J.H. Han J.A. Jeon K.C. Kim M.H. Lee L. Lutz A. Malinin M. Mangin-Brinet P.S. Marrocchesi P. Maestro A. Menchaca-Rocha S. Minnick S.I. Mognet S. Nam S. Nutter I.H. Park N.H. Park A. Putze R. Sina S. Swordy S. Wakely P. Walpole J. Wu J. Yang Y.S. Yoon R. Zei S.Y. Zinn 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008
The Cosmic-Ray Energetics And Mass balloon-borne experiment has been launched twice in Antarctica, first in December 2004 and again in December 2005. It circumnavigated the South Pole three times during the first flight, which set a flight duration record of 42 days. A cumulative duration of 70 days within 13 months was achieved when the second flight completed 28 days during two circumnavigations of the Pole on 13 January 2006. Both the science instrument and support systems functioned extremely well, and a total 117 GB of data including 67 million science events were collected during these two flights. Preliminary analysis indicates that the data extend well above 100 TeV and follow reasonable power laws. The payload recovered from the first flight has been refurbished for the third flight in 2007, whereas the payload from the second flight is being refurbished to be ready for the fourth flight in 2008. Each flight will extend the reach of precise cosmic-ray composition measurements to energies not previously possible. 相似文献
12.
The Magnetospheric Multiscale Magnetometers 总被引:2,自引:0,他引:2
C. T. Russell B. J. Anderson W. Baumjohann K. R. Bromund D. Dearborn D. Fischer G. Le H. K. Leinweber D. Leneman W. Magnes J. D. Means M. B. Moldwin R. Nakamura D. Pierce F. Plaschke K. M. Rowe J. A. Slavin R. J. Strangeway R. Torbert C. Hagen I. Jernej A. Valavanoglou I. Richter 《Space Science Reviews》2016,199(1-4):189-256
The success of the Magnetospheric Multiscale mission depends on the accurate measurement of the magnetic field on all four spacecraft. To ensure this success, two independently designed and built fluxgate magnetometers were developed, avoiding single-point failures. The magnetometers were dubbed the digital fluxgate (DFG), which uses an ASIC implementation and was supplied by the Space Research Institute of the Austrian Academy of Sciences and the analogue magnetometer (AFG) with a more traditional circuit board design supplied by the University of California, Los Angeles. A stringent magnetic cleanliness program was executed under the supervision of the Johns Hopkins University’s Applied Physics Laboratory. To achieve mission objectives, the calibration determined on the ground will be refined in space to ensure all eight magnetometers are precisely inter-calibrated. Near real-time data plays a key role in the transmission of high-resolution observations stored on board so rapid processing of the low-resolution data is required. This article describes these instruments, the magnetic cleanliness program, and the instrument pre-launch calibrations, the planned in-flight calibration program, and the information flow that provides the data on the rapid time scale needed for mission success. 相似文献
13.
Frits Paerels Jelle Kaastra Takaya Ohashi Philipp Richter Andrei Bykov Jukka Nevalainen 《Space Science Reviews》2008,134(1-4):405-418
We briefly review capabilities and requirements for future instrumentation in UV- and X-ray astronomy that can contribute
to advancing our understanding of the diffuse, highly ionised intergalactic medium. 相似文献
14.
Automation and Robotics (A&R) systems are a key technology for Mars exploration. All over the world initiatives in this field aim at developing new A&R systems and technologies for planetary surface exploration. From December 2000 to February 2002 Kayser-Threde GmbH, Munich, Germany lead a study called AROMA (Automation and Robotics for Human Mars Exploration) under ESA contract in order to define a reference architecture of A&R elements in support of a human Mars exploration program. One of the goals of this effort is to initiate new developments and to maintain the competitiveness of European industry within this field. 相似文献
15.
The design of a circular acoustic array with uniformly spaced elements is carried out using linear programming. The size of the linear program to be solved is reduced by imposing symmetry conditions on the complex element weights. The cost function used minimizes the beamwidth over a range of frequencies for a specified maximum sidelobe level. 相似文献
16.
B. Kneissel G. H. Schwehm C. Leinert I. Richter B. Planck 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1982,2(12):163-166
Shortly after it passed through perihelion on February 25, 1976 Comet West was observed by the Helios Zodiacal Light Experiment. Broadband photopolarimetric measurements of the head and of the tail were performed in three wavelength bands (U, B, V). The phase angles encountered range from 67° to 85°. The polarization measurements indicated wavelength independent linear polarization. The maximum degree of polarization in the visual channel was found to be .28 at a phase angle of 83°. 相似文献
17.
D.-P. Häder P. Richter M. Schuster Ts. Dachev B. Tomov Pl. Georgiev Yu. Matviichuk 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2009
Solar and space radiation have been monitored using the R3D-B2 radiation risks radiometer-dosimeter on board a recent space flight on the Russian satellite Foton M2 within the ESA Biopan 5 facility mounted on the outside of the satellite exposed to space conditions. The solar radiation has been assayed in four wavelength bands (UV-C, 170–280 nm, UV-B, 280–315 nm), UV-A (315–400 nm) and PAR (photosynthetic active radiation, 400–700 nm). The data show an increasing tumbling rotation of the satellite during the mission. The photodiodes do not show a cosine response to the incident light which has been corrected. After calibration of the signals using the extraterrestrial spectrum, doses have been calculated for each orbit, for each day and for the total mission as basic data for the biological material which has been exposed in parallel in the Biopan facility. Cosmic ionizing radiation has been monitored and separated in 256 deposited energy spectra, which were further used for determination of the absorbed dose rate and flux. Basic data tables were prepared to be used by other Biopan 5 experiments. The paper summarizes the results for the Earth radiation environment at the altitude (262–304 km) of the Foton M2 spacecraft. Comparisons with the predictions of NASA Earth radiation environment experimental models AE-8 and AP-8, and the PSB97 model are also presented, which calculate the fluxes of ionizing radiation from a simulation. AP-8 is a model for trapped radiation. 相似文献
18.
The THEMIS Fluxgate Magnetometer 总被引:2,自引:0,他引:2
H. U. Auster K. H. Glassmeier W. Magnes O. Aydogar W. Baumjohann D. Constantinescu D. Fischer K. H. Fornacon E. Georgescu P. Harvey O. Hillenmaier R. Kroth M. Ludlam Y. Narita R. Nakamura K. Okrafka F. Plaschke I. Richter H. Schwarzl B. Stoll A. Valavanoglou M. Wiedemann 《Space Science Reviews》2008,141(1-4):235-264
19.
Loren Chang Scott Palo Maura Hagan Jadwiga Richter Rolando Garcia Dennis Riggin David Fritts 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(9):1398-1407
As part of an ongoing effort to understand the migrating diurnal tide generated by the NCAR Whole Atmosphere Community Climate Model, version 3 (WACCM3), we compare the WACCM3 migrating diurnal tide in the horizontal wind and temperature fields to similar results from the Global Scale Wave Model (GSWM). The WACCM3 diurnal tidal wind fields are also compared to tropical radar measurements at Kauai (22°N, 200.2°E) and Rarotonga (21.3°S, 199.7°E). The large-scale features of the WACCM3 results, such as the global spatial structure and the semiannual amplitude variation are in general agreement with past tidal studies; however, several differences do exist. WACCM3 exhibits a much higher degree of hemispheric asymmetry, lower overall amplitudes around the equinoxes, and peaks which are more confined in latitude when compared with the GSWM. Factors which may contribute to such differences between WACCM3 and GSWM are the solar heating profiles from ozone and water vapor, dissipation, and the zonal mean zonal winds. We find that the internally generated heating in WACCM3 and eddy dissipation values are both smaller than the values specified in the GSWM; the eddy dissipation fields and zonal mean zonal winds of the two models also display measurable differences in spatial structure. Comparisons with radar data show several differences in spatial and seasonal structure. In particular, the diurnal tide zonal winds in WACCM3 above Kauai are considerably larger in amplitude than those observed in the radar data, due to contributions from nonmigrating tidal components including wave numbers eastward 1 through 3, westward 2, and stationary components, which interfere constructively with the migrating component around equinox in WACCM3. 相似文献
20.
J. S. Kaastra F. B. S. Paerels F. Durret S. Schindler P. Richter 《Space Science Reviews》2008,134(1-4):155-190
We discuss the different physical processes that are important to understand the thermal X-ray emission and absorption spectra
of the diffuse gas in clusters of galaxies and the warm-hot intergalactic medium. The ionisation balance, line and continuum
emission and absorption properties are reviewed and several practical examples are given that illustrate the most important
diagnostic features in the X-ray spectra. 相似文献