共查询到20条相似文献，搜索用时 671 毫秒
1.
High-resolution studies of the Sun’s magnetic fields are needed for a better understanding of the fundamental processes responsible for solar variability. The generation of magnetic fields through dynamo processes, the amplification of fields through the interaction with plasma flows, and the destruction of fields are poorly understood. There is incomplete insight into physical mechanisms responsible for chromospheric and coronal structure and heating, causes of variations in the radiative output of the Sun, and mechanisms that trigger flares and coronal mass ejections. Progress in answering these critical questions requires study of the interaction of the magnetic field and convection with a resolution sufficient to observe scale fundamental to these processes. The planned 4 m aperture ATST will be a unique scientific tool, with excellent angular resolution, a large wavelength range, and low scattered light. With its integrated adaptive optics, the ATST will achieve a spatial resolution nearly 10 times better than any existing solar telescope. The ATST design and development phase began in 2001 and it is now ready to begin construction in 2009. 相似文献
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David Black John Dyer Kenji Nishioka Jeffrey Scargle Charlie Sobeck Eugene Levy Robert McMillan Michael Castelaz George Gatewood Andrew Buffington 《Astrophysics and Space Science》1991,177(1-2):307-313
Summary The Astrometric Telescope Facility (ATF) proposed for use on NASA's planned Space Station is similar in form and data output to ground-based long focus astrometric instruments. With a focal plane scale of 12.7 arc seconds/mm, the strawman design has a field size of 10 arc min square and a limiting visual magnitude fainter than 16. Output from an observation includes the X and Y coordinates of each star and its relative brightness. The targeted precision for the AFT is 0.00001 arc seconds.Portions of the observing program will be made available to members of the astronomical community. 相似文献
3.
A giant radio telescope for observing galactic and extragalactic radio sources at metre wavelengths is proposed. By locating a parabolic cylindrical antenna at a site close to the Equator such that its axis lies parallel to earth's axis, it is possible to construct a large collecting area economically. The proposed instrument will be very powerful for studying compact and diffuse features of radio sources, monitoring their variability, recombination and deuterium line work, studies of interplanetary medium and pulsar search.Paper presented at the Lembang-Bamberg IAU Colloquium No. 80 on Double Stars: Physical Properties and Generic Relations, held at Bandung, Indonesia, 3–7 June, 1983. 相似文献
4.
Juan José Hernández-Rey 《Astrophysics and Space Science》2005,297(1-4):257-267
Whilst the number of observed astrophysical sources of γ-rays is now moderately high, only three astrophysical objects have
been studied with neutrinos, namely the Sun, a supernova (SN1987A) and the Earth (its atmosphere). However, astro-neutrinos
may give a new boost to astrophysics, similar to the impressive progress provided during the last decades by γ-rays. The ANTARES
collaboration aims to build a large neutrino telescope under the Mediterranean Sea at a depth of 2500 m. To reach this goal,
a remarkable effort of R&D has been performed in recent years that has culminated in the deployment, connection and operation
of two prototype strings. The final detector will be composed of 12 strings and will be ready by 2007. 相似文献
5.
Arthur Kosowsky 《New Astronomy Reviews》2003,47(11-12):939
The proposed Atacama Cosmology Telescope (ACT) project is described. This multi-institution collaboration aims to produce arcminute-resolution and micro-Kelvin sensitivity maps of the microwave background temperature over 200 square degree of the sky in three frequency bands. We give a brief overview of the scientific motivations for such a map, followed by a design outline of our 6-m custom telescope, an overview of our proposed bolometer array detector technology, and site considerations and scan strategy. We also describe associated optical and X-ray galaxy cluster surveys. 相似文献
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R. Albrecht 《Astrophysics and Space Science》1997,258(1-2):295-299
The design life time of the Hubble Space Telescope will nominally end in 2005. Even though it might be possible to extend
the operational life beyond that date it is evident that a successor to Hubble must be planned for now. Based on the report
‘HST and Beyond’ (Dressler 1996)) and aligned with the NASA ‘Origins’ program a study has been initiated to explore options
for a telescope with an aperture of larger than 4 meters and possibly as large as 8 meters, optimized for the near infrared
(≈ 1-5 micron) to be placed in an orbit far from Earth. The study started in December 1995 and has been proceeding with considerable
momentum. At the current time three studies have been completed (NASA in-house, TRW, and Lockheed), which are being used to
explore technological and programmatic challenges. The studies are to be merged. It is impressive to see what can be done
with existing technology and within the capabilities of existing organizational arrangements. The goal is to complete the
study within one year with the goal of entering into phase A as soon as possible. Formal agreements between ESA and NASA will
have to be negotiated if Europe is to play a meaningful role in this exercise. Without such agreements, it is clear that European
astronomers will not have access to the NGST in the way that they currently enjoy the opportunities provided by the HST.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
8.
Y. Suematsu S. Tsuneta K. Ichimoto T. Shimizu M. Otsubo Y. Katsukawa M. Nakagiri M. Noguchi T. Tamura Y. Kato H. Hara M. Kubo I. Mikami H. Saito T. Matsushita N. Kawaguchi T. Nakaoji K. Nagae S. Shimada N. Takeyama T. Yamamuro 《Solar physics》2008,249(2):197-220
The Solar Optical Telescope (SOT) aboard the Solar-B satellite (Hinode) is designed to perform high-precision photometric and polarimetric observations of the Sun in visible light spectra (388 – 668 nm)
with a spatial resolution of 0.2 – 0.3 arcsec. The SOT consists of two optically separable components: the Optical Telescope
Assembly (OTA), consisting of a 50-cm aperture Gregorian with a collimating lens unit and an active tip-tilt mirror, and an
accompanying Focal Plane Package (FPP), housing two filtergraphs and a spectro-polarimeter. The optomechanical and optothermal
performance of the OTA is crucial to attain unprecedented high-quality solar observations. We describe in detail the instrument
design and expected stable diffraction-limited on-orbit performance of the OTA, the largest state-of-the-art solar telescope
yet flown in space. 相似文献
9.
Jason Spyromilio 《Experimental Astronomy》2009,26(1-3):19-34
The evolution of telescope mounts and domes is presented as the astronomical use of the telescope is about to reach its 400th anniversary. The changes in the mechanical designs are traced to requirements generated from the evolution of detectors and instrumentation. 相似文献
10.
Five-hundred-meter Aperture Spherical Telescope project 总被引：2，自引：0，他引：2
A Five hundred meter Aperture Spherical Telescope (FAST) is proposed to be built in the unique karst area of southwest China,
and will act, in a sense, as a prototype for the Square Kilometer Array (SKA). It will be over twice as large as the Arecibo
telescope coupled with much wider sky coverage. Some results from site surveys for such a SKA concept are briefly reported.
Technically, FAST is not simply a copy of the existing Arecibo telescope but has rather a number of innovations. Firstly,
the proposed main spherical reflector, by conforming to a paraboloid of revolution in real time through actuated active control,
enables the realization of both wide bandwidth and full polarization capability while using standard feed design. Secondly,
a feed support system which integrates optical, mechanical and electronic technologies will effectively reduce the cost of
the support structure and control system. Pre-research on FAST has become a key project in the CAS.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Recent developments at Canada-France-Hawaii Telescope 总被引：1，自引：0，他引：1
Robert McLaren 《Astrophysics and Space Science》1989,160(1-2):255-262
Recent developments at CFHT are described with particular emphasis in the following areas: image quality, techniques for high-resolution imaging, computers, and communications.Paper presented at the Symposium on the JNLT and Related Engineering Development, Tokyo, November 29–December 2, 1988. 相似文献
14.
Richard S. Ellis 《Astrophysics and Space Science》1989,160(1-2):107-110
The current status and the organization of the UK Large Telescope programme are summarized. Some scientific and design issues are discussed on the basis of work done for the SERC Large Telescope Panel report. A national Phase A programme is now underway addressing more detailed aspects of these questions. This study will culminate in a final proposal for funding in 1990.Paper presented at the Symposium on the JNLT and Related Engineering Developments, Tokyo, November 29–December 2, 1988. 相似文献
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Liang-Tai George Chiu 《Celestial Mechanics and Dynamical Astronomy》1980,22(2):191-196
The astrometric application of the Wide Field Camera and the Planetary Camera is reviewed. It is shown that the digital image centering algorithms can yield a positional accuracy of 0.1 milli-arcsecond. Deconvolution of CCD's sensitivity, non-flatness of the filters, and crinkling of the CCD surface may limit the positional accuracy to 1 milli-arcsecond.Presented at the Symposium Star Catalogues, Positional Astronomy and Celestial Mechanics, held in honor of Paul Herget at the U.S. Naval Observatory, Washington, November 30, 1978. 相似文献
18.
Minoru Ando Tetsuya Nagata Shuji Sato Makoto Watanabe Kunio Itoh Toshihide Kawai Hidehiko Nakaya Yoshiharu Namba Takeshi Takezawa 《Experimental Astronomy》2002,13(3):119-134
We constructed a wide field cryogenic telescope (WFCT) containing a whole Ritchey-Chrétien system and a focal plane array
in a cryostat for near infrared observations to cover the field of view of 0.4°. The telescope has a primary mirror of 220
mm and an engineering grade 256 × 256 InSb array. The optical components such as two mirrors, filters, spiders, and radiation
shield tube are cooled down to 180 K as well as the InSb array to 35 K by a mechanical refrigerator. We show the results of
the background surface brightnesses and the limiting magnitudes at 3.3 and 3.67 μm measured at Sutherland, South Africa. We
describe the on-going upgrade of this instrument, equipped with a 1024 × 1024 ALADDIN InSb science grade array.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
19.
D. Elmore 《Astronomische Nachrichten》2010,331(6):655-657
This article describes the use of the telescope output Stokes vector measured during a polarization calibration to infer the properties of mirrors in the telescope itself. Polarization calibrations performed at the National Solar Observatory Dunn Solar Telescope are used to demonstrate this technique (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
20.
C. R. O’Dell 《Experimental Astronomy》2009,25(1-3):261-272
The Hubble Space Telescope has been the most successful space astronomy project to date, producing images that put the public in awe and images and spectra that have produced many scientific discoveries. It is the natural culmination of a dream envisioned when rocket flight into space was first projected and a goal set for the US space program soon after NASA was created. The design and construction period lasted almost two decades and its operations have already lasted almost as long. The capabilities of the observatory have evolved and expanded with periodic upgrading of its instrumentation, thus realizing the advantages of its unique design. The success of this long-lived observatory is closely tied to the availability of the Space Shuttle and the end of the Shuttle program means that the end of the Hubble program will follow before long. 相似文献