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排序方式: 共有249条查询结果,搜索用时 156 毫秒
41.
M. Combes V. I. Moroz J. F. Crifo J. P. Bibring N. Coron J. Crovisier T. Encrenaz N. F. Sanko A. Grigoriev D. Bockele-Morvan R. Gispert C. Emerich J. M. Lamarre F. Rocard V. A. Krasnopolsky T. Owen 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1985,5(12):127-131
Results of the 2.5–5 micron spectroscopic channel of the IKS instrument on Vega are reported and the data reduction process is described. H2O and CO2 molecules have been detected with production rates of 1030 s−1 and 1.5 1028 s−1 respectively. Emission features between 3.3 and 3.7 microns are tentatively attributed to CH - bearing compounds - CO is marginally detected with a mixing ratio CO/H2O 0.2. OH emission and H2O - ice absorption might also be present in the spectra. 相似文献
42.
J.-A. Sauvaud D. Larson C. Aoustin D. Curtis J.-L. Médale A. Fedorov J. Rouzaud J. Luhmann T. Moreau P. Schröder P. Louarn I. Dandouras E. Penou 《Space Science Reviews》2008,136(1-4):227-239
SWEA, the solar wind electron analyzers that are part of the IMPACT in situ investigation for the STEREO mission, are described. They are identical on each of the two spacecraft. Both are designed to provide detailed measurements of interplanetary electron distribution functions in the energy range 1~3000 eV and in a 120°×360° solid angle sector. This energy range covers the core or thermal solar wind plasma electrons, and the suprathermal halo electrons including the field-aligned heat flux or strahl used to diagnose the interplanetary magnetic field topology. The potential of each analyzer will be varied in order to maintain their energy resolution for spacecraft potentials comparable to the solar wind thermal electron energies. Calibrations have been performed that show the performance of the devices are in good agreement with calculations and will allow precise diagnostics of all of the interplanetary electron populations at the two STEREO spacecraft locations. 相似文献
43.
We study the solar cycle, radial, and latitudinal dependence of the characteristics of magnetic field irregularities in the
Heliosphere. The frequency of magnetic field discontinuities is determined, using high time resolution magnetic field observations
by Ulysses, covering the time interval from 1992 to 2000. The quasi-linear scattering mean free path of particles is also calculated.
These investigations aim at understanding/exploring transport properties of energetic charged particles in the Heliosphere.
We find that the travel time of solar wind plasma from the Sun to the observer is the key parameter of the process, by controling
the decay of the irregularities.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
44.
At solar maximum, the large-scale structure of the heliospheric magnetic field (HMF) reflects the complexity of the Sun's
coronal magnetic fields. The corona is characterised by mostly closed magnetic structures and short-lived, small coronal holes.
The axis of the Sun's dipole field is close to the solar equator; there are also important contributions from the higher order
terms. This complex and variable coronal magnetic configuration leads to a much increased variability in the HMF on all time
scales, at all latitudes. The transition from solar minimum to solar maximum conditions, as reflected in the HMF, is described,
as observed by Ulysses during its passage to high southern heliolatitudes. The magnetic signatures associated with the interaction regions generated
by short-lived fast solar wind streams are presented, together with the highly disordered period in mid-1999 when there was
a considerable reorganisation in coronal structures. The magnetic sector structure at high heliolatitudes shows, from mid-1999,
a recognisable two-sector structure, corresponding to a highly inclined Heliospheric Current Sheet. A preliminary investigation
of the radial component of the magnetic field indicates that it remains, on average, constant as a function of heliolatitude.
Intervals of highly Alfvénic fluctuations in the rarefaction regions trailing the interaction regions have been, even if intermittently,
identified even close to solar maximum.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
45.
46.
B. Holback S. -E. Jansson L. Åhlén G. Lundgren L. Lyngdal S. Powell A. Meyer 《Space Science Reviews》1994,70(3-4):577-592
The Wave Experiment, F4, on the Swedish/German satelliteFreja, is designed to measure the electric wave fields up to 4 MHz, the magnetic wave fields up to 16 kHz and the plasma density and its relative variations up to 2 kHz. Six wave signals and four density probe signals can be measured simultaneously. The wave forms of all signals are transmitted to ground without any analysis onboard. The limited TM allocation does not allow continuous sampling of the wave signals, so normally the measurements are made in snapshots of various lengths dependent on sampling frequency, etc. Continuous sampling can be made for shorter time periods by using a 6 Mbyte memory as a buffer. 相似文献
47.
Frey H.U. Mende S.B. Immel T.J. Gérard J.-C. Hubert B. Habraken S. Spann J. Gladstone G.R. Bisikalo D.V. Shematovich V.I. 《Space Science Reviews》2003,109(1-4):255-283
Direct imaging of the magnetosphere by instruments on the IMAGE spacecraft is supplemented by simultaneous observations of the global aurora in three far ultraviolet (FUV) wavelength bands. The purpose of the multi-wavelength imaging is to study the global auroral particle and energy input from the magnetosphere into the atmosphere. This paper describes the method for quantitative interpretation of FUV measurements. The Wide-Band Imaging Camera (WIC) provides broad band ultraviolet images of the aurora with maximum spatial resolution by imaging the nitrogen lines and bands between 140 and 180 nm wavelength. The Spectrographic Imager (SI), a dual wavelength monochromatic instrument, images both Doppler-shifted Lyman-α emissions produced by precipitating protons, in the SI-12 channel and OI 135.6 nm emissions in the SI-13 channel. From the SI-12 Doppler shifted Lyman-α images it is possible to obtain the precipitating proton flux provided assumptions are made regarding the mean energy of the protons. Knowledge of the proton (flux and energy) component allows the calculation of the contribution produced by protons in the WIC and SI-13 instruments. Comparison of the corrected WIC and SI-13 signals provides a measure of the electron mean energy, which can then be used to determine the electron energy flux. To accomplish this, reliable emission modeling and instrument calibrations are required. In-flight calibration using early-type stars was used to validate the pre-flight laboratory calibrations and determine long-term trends in sensitivity. In general, very reasonable agreement is found between in-situ measurements and remote quantitative determinations. 相似文献
48.
文章介绍了法国宇航环境工程试验中心(INTESPACE)为满足阿里安娜-V的需要所准备进行的一系列改造.这些工作主要有:增建一个适合大型容器用的空气锁,保持厅内连续的10万级洁净度,建立一个紧凑试验区域,建造一面强效吸波墙,扩展振动设备能力以及改造原热真空设备.这些工作计划于2001年初全部完成.改造工作的完成将保证INTESPACE在独立的欧洲试验中心中继续处于领先地位. 相似文献
49.
Brigitte Knapmeyer-Endrun Naomi Murdoch Balthasar Kenda Matthew P. Golombek Martin Knapmeyer Lars Witte Nicolas Verdier Sharon Kedar Philippe Lognonné William B. Banerdt 《Space Science Reviews》2018,214(5):94
Based on an updated model of the regolith’s elastic properties, we simulate the ambient vibrations background wavefield recorded by InSight’s Seismic Experiment for Interior Structure (SEIS) on Mars to characterise the influence of the regolith and invert SEIS data for shallow subsurface structure. By approximately scaling the synthetics based on seismic signals of a terrestrial dust devil, we find that the high-frequency atmospheric background wavefield should be above the self-noise of SEIS’s SP sensors, even if the signals are not produced within 100–200 m of the station. We compare horizontal-to-vertical spectral ratios and Rayleigh wave ellipticity curves for a surface-wave based simulation on the one hand with synthetics explicitly considering body waves on the other hand and do not find any striking differences. Inverting the data, we find that the results are insensitive to assumptions on density. By contrast, assumptions on the velocity range in the upper-most layer have a strong influence on the results also at larger depth. Wrong assumptions can lead to results far from the true model in this case. Additional information on the general shape of the curve, i.e. single or dual peak, could help to mitigate this effect, even if it cannot directly be included into the inversion. We find that the ellipticity curves can provide stronger constraints on the minimum thickness and velocity of the second layer of the model than on the maximum values. We also consider the effect of instrumentation resonances caused by the lander flexible modes, solar panels, and the SEIS levelling system. Both the levelling system resonances and the lander flexible modes occur at significantly higher frequencies than the expected structural response, i.e. above 35 Hz and 20 Hz, respectively. While the lander and solar panel resonances might be too weak in amplitude to be recorded by SEIS, the levelling system resonances will show up clearly in horizontal spectra, the H/V and ellipticity curves. They are not removed by trying to extract only Rayleigh-wave dominated parts of the data. However, they can be distinguished from any subsurface response by their exceptionally low damping ratios of 1% or less as determined by random decrement analysis. The same applies to lander-generated signals observed in actual data from a Moon analogue experiment, so we expect this analysis will be useful in identifying instrumentation resonances in SEIS data. 相似文献
50.
Alberto G. Fairén Dirk Schulze-Makuch Lyle Whyte Victor Parro Alexander Pavlov Javier Gómez-Elvira Armando Azua-Bustos Wolfgang Fink Victor Baker 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2019,63(5):1491-1497
Future efforts towards Mars exploration should include a discussion about the effects that the strict application of Planetary Protection policies is having on the astrobiological exploration of Mars, which is resulting in a continued delay in the search for Martian life. As proactive steps in the path forward, here we propose advances in three areas. First, we suggest that a redefinition of Planetary Protection and Special Regions is required for the case of Mars. Particularly, we propose a definition for special places on Mars that we can get to in the next 10–20?years with rovers and landers, where try to address questions regarding whether there is present-day near-surface life on Mars or not, and crucially doing so before the arrival of manned missions. We propose to call those special places “Astrobiology Priority Exploration” regions (APEX regions). Second, we stress the need for the development of robotic tools for the characterization of complex organic compounds as unequivocal signs of life, and particularly new generations of complex organic chemistry and biosignature detection instruments, including advances in DNA sequencing. And third, we advocate for a change from the present generation of SUV-sized landers and rovers to new robotic assets that are much easier to decontaminate such as microlanders: they would be very small with limited sensing capabilities, but there would be many of them available for launch and coordination from an orbiting platform. Implementing these changes will help to move forward with an exploration approach that is much less risky to the potential Mars biosphere, while also being much more scientifically rigorous about the exploration of the “life on Mars” question – a question that needs to be answered both for astrobiological discovery and for learning more definitive lessons on Planetary Protection. 相似文献