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排序方式: 共有117条查询结果,搜索用时 390 毫秒
51.
Bozdağ Ebru Ruan Youyi Metthez Nathan Khan Amir Leng Kuangdai van Driel Martin Wieczorek Mark Rivoldini Attilio Larmat Carène S. Giardini Domenico Tromp Jeroen Lognonné Philippe Banerdt Bruce W. 《Space Science Reviews》2017,211(1-4):571-594
Space Science Reviews - We present global and regional synthetic seismograms computed for 1D and 3D Mars models based on the spectral-element method. For global simulations, we implemented a... 相似文献
52.
Mark Schoeberl 《Acta Astronautica》2004,54(11-12):845
53.
Gordon Chin Scott Brylow Marc Foote James Garvin Justin Kasper John Keller Maxim Litvak Igor Mitrofanov David Paige Keith Raney Mark Robinson Anton Sanin David Smith Harlan Spence Paul Spudis S. Alan Stern Maria Zuber 《Space Science Reviews》2007,129(4):391-419
NASA’s Lunar Precursor Robotic Program (LPRP), formulated in response to the President’s Vision for Space Exploration, will
execute a series of robotic missions that will pave the way for eventual permanent human presence on the Moon. The Lunar Reconnaissance
Orbiter (LRO) is first in this series of LPRP missions, and plans to launch in October of 2008 for at least one year of operation.
LRO will employ six individual instruments to produce accurate maps and high-resolution images of future landing sites, to
assess potential lunar resources, and to characterize the radiation environment. LRO will also test the feasibility of one
advanced technology demonstration package. The LRO payload includes: Lunar Orbiter Laser Altimeter (LOLA) which will determine
the global topography of the lunar surface at high resolution, measure landing site slopes, surface roughness, and search
for possible polar surface ice in shadowed regions, Lunar Reconnaissance Orbiter Camera (LROC) which will acquire targeted
narrow angle images of the lunar surface capable of resolving meter-scale features to support landing site selection, as well
as wide-angle images to characterize polar illumination conditions and to identify potential resources, Lunar Exploration
Neutron Detector (LEND) which will map the flux of neutrons from the lunar surface to search for evidence of water ice, and
will provide space radiation environment measurements that may be useful for future human exploration, Diviner Lunar Radiometer
Experiment (DLRE) which will chart the temperature of the entire lunar surface at approximately 300 meter horizontal resolution
to identify cold-traps and potential ice deposits, Lyman-Alpha Mapping Project (LAMP) which will map the entire lunar surface
in the far ultraviolet. LAMP will search for surface ice and frost in the polar regions and provide images of permanently
shadowed regions illuminated only by starlight. Cosmic Ray Telescope for the Effects of Radiation (CRaTER), which will investigate
the effect of galactic cosmic rays on tissue-equivalent plastics as a constraint on models of biological response to background
space radiation. The technology demonstration is an advanced radar (mini-RF) that will demonstrate X- and S-band radar imaging
and interferometry using light weight synthetic aperture radar. This paper will give an introduction to each of these instruments
and an overview of their objectives. 相似文献
54.
The Mercury Atmospheric and Surface Composition Spectrometer (MASCS) is one of seven science instruments onboard the MErcury
Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft en route to the planet Mercury. MASCS consists
of a small Cassegrain telescope with 257-mm effective focal length and a 50-mm aperture that simultaneously feeds an UltraViolet
and Visible Spectrometer (UVVS) and a Visible and InfraRed Spectrograph (VIRS). UVVS is a 125-mm focal length, scanning grating,
Ebert-Fastie monochromator equipped with three photomultiplier tube detectors that cover far ultraviolet (115–180 nm), middle
ultraviolet (160–320 nm), and visible (250–600 nm) wavelengths with an average 0.6-nm spectral resolution. It will measure
altitude profiles of known species in order to determine the composition and structure of Mercury’s exosphere and its variability
and will search for previously undetected exospheric species. VIRS is a 210-mm focal length, fixed concave grating spectrograph
equipped with a beam splitter that simultaneously disperses the spectrum onto a 512-element silicon visible photodiode array
(300–1050 nm) and a 256-element indium-gallium-arsenide infrared photodiode array 850–1,450 nm. It will obtain maps of surface
reflectance spectra with a 5-nm resolution in the 300–1,450 nm wavelength range that will be used to investigate mineralogical
composition on spatial scales of 5 km. UVVS will also observe the surface in the far and middle ultraviolet at a 10-km or
smaller spatial scale. This paper summarizes the science rationale and measurement objectives for MASCS, discusses its detailed
design and its calibration requirements, and briefly outlines observation strategies for its use during MESSENGER orbital
operations around Mercury. 相似文献
55.
Launch and Early Operation of the MESSENGER Mission 总被引:1,自引:0,他引:1
On August 3, 2004, at 2:15 a.m. EST, the MESSENGER mission to Mercury began with liftoff of the Delta II 7925H launch vehicle
and 1,107-kg spacecraft including seven instruments. MESSENGER is the seventh in the series of NASA Discovery missions, the
third to be built and operated by The Johns Hopkins University Applied Physics Laboratory (JHU/APL) following the Near Earth
Asteroid Rendezvous (NEAR) Shoemaker and Comet Nucleus Tour (CONTOUR) missions. The MESSENGER team at JHU/APL is using efficient
operations approaches developed in support of the low-cost NEAR and CONTOUR operations while incorporating improved approaches
for reducing total mission risk. This paper provides an overview of the designs and operational practices implemented to conduct
the MESSENGER mission safely and effectively. These practices include proven approaches used on past JHU/APL operations and
new improvements implemented to reduce risk, including adherence to time-proven standards of conduct in the planning and implementation
of the mission. This paper also discusses the unique challenges of operating in orbit around Mercury, the closest planet to
the Sun, and what specific measures are being taken to address those challenges. 相似文献
56.
Automated Route Selection for Navigation 总被引:1,自引:0,他引:1
57.
Hugh C. Pumphrey Richard E. Cofield Mark J. Filipiak Nathaniel J. Livesey 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2009
The Microwave Limb Sounder (MLS) instrument is a small satellite-borne radio telescope. Its purpose is to make limb-scanning measurements of atmospheric composition. One of the gases to which it is sensitive is carbon monoxide (CO), detected via the J = 2 → 1 rotational transition at 230 GHz. CO is present in molecular gas clouds in the Milky Way. Although it was not designed for the purpose, MLS can detect emissions from galactic CO, allowing a map of the 230 GHz radio sky to be constructed. We report the MLS measurements of galactic radio emission and discuss their effect on the atmospheric mission of MLS. The region of the Milky Way with emissions strong enough to significantly affect MLS observations of atmospheric CO is identified. Ground-based radio astronomers have been mapping the sky using CO emission for many years. However, the MLS data are the first such survey to be carried out from space. The MLS survey covers a larger area of the sky than any other 230 GHz survey, but no previously unknown gas clouds are observed. 相似文献
58.
As one of the promising configurations of the next generation of commercial aircraft,research on departure characteristics of the Blended-Wing-Body(BWB) is of great signification to safe flight limits. A three-degree-of-freedom(3-DOF) virtual flight test in a wind tunnel has been implemented for a candidate configuration to predict the departure characteristics. The support mechanism, the test model and the control law of the virtual flight test are introduced. In order to show the relationship ... 相似文献
59.
White Oran R. Fox Peter A. Meisner Randy Rast Mark P. Yasukawa Eric Koon Darryl Rice Crystal Lin Haosheng Kuhn Jeff Coulter Roy 《Space Science Reviews》2000,94(1-2):75-82
Two Precision Solar Photometric Telescopes (PSPT) designed and built at the U.S. National Solar Observatory (NSO) are in operation in Rome and Hawaii. A third PSPT is now in operation the NSO at Sunspot, NM. The PSPT system records full disk solar images at three wavelengths: K line at 393.3 nm and two continua at 409 nm and 607 nm throughout the observing day. We currently study properties of limb darkening, sunspots, and network in these images with particular emphasis on data taken in July and September 1998. During this period, the number of observations per month was high enough to show directional properties of the radiation field surrounding sunspots. We show examples of our PSPT images and describe our study of bright rings around sunspots. 相似文献
60.
Valerie C. Thomas Joseph M. Makowski G. Mark Brown John F. McCarthy Dominick Bruno J. Christopher Cardoso W. Michael Chiville Thomas F. Meyer Kenneth E. Nelson Betina E. Pavri David A. Termohlen Michael D. Violet Jeffrey B. Williams 《Space Science Reviews》2011,163(1-4):175-249
The Dawn spacecraft is designed to travel to and operate in orbit around the two largest main belt asteroids, Vesta and Ceres. Developed to meet a ten-year life and fully redundant, the spacecraft accommodates an ion propulsion system, including three ion engines and xenon propellant tank, utilizes large solar arrays to power the engines, carries the science instrument payload, and hosts the hardware and software required to successfully collect and transmit the scientific data back to Earth. The launch of the Dawn spacecraft in September 2007 from Cape Canaveral Air Force Station was the culmination of nearly five years of design, development, integration and testing of this unique system, one of the very few scientific spacecraft to rely on ion propulsion. The Dawn spacecraft arrived at its first destination, Vesta, in July 2011, where it will conduct science operations for twelve months before departing for Ceres. 相似文献