Showing papers in "Advances in Space Research in 2003"

TL;DR: An overview of the ongoing work performed at the NOAA Space Environment Center is presented with examples illustrating: (a) global 3D interaction of a CME propagating in structured background solar wind, (b) incorporation of a more realistic ambient solar wind and (c) merging of coronal and heliospheric models to track CMEs, and (d) near-Earth solar wind simulations as discussed by the authors.

TL;DR: In this paper, nearly identical copies of MODIS have been operating onboard the Earth Observing System (EOS) Terra and Aqua satellites for 34 and 5 months respectively, respectively.

TL;DR: In this paper, a new long-wavelength global gravity field model, called EIGEN-2, has been derived in a German/French effort using GPS-CHAMP satellite-to-satellite tracking and on-board accelerometer data over a time span of altogether six months.

TL;DR: In this article, the authors investigated organic volatiles and water in Oort Cloud comets at infrared wavelengths and found that parent volatile production rates are highly robust, permitting a sensitive search for compositional diversity among comets.

TL;DR: The inability of the 0 g grown osteoblast to respond to sera activation suggests that there is a major alteration in anabolic signal transduction under microgravity conditions, most probably through the growth factor receptors and/or the associated kinase pathways that are connected to the cytoskeleton.

TL;DR: The main characteristics of the mission as well as the necessary adaptation to the minisat constraints are described in this article, where the authors present the main characteristics and characteristics of COROT.

TL;DR: Future space farmers will have to adapt their practices to accommodate microgravity, high and low extremes in ambient temperatures, reduced atmospheric pressures, atmospheres containing high volatile organic carbon contents, and elevated to super-elevated CO2 concentrations.

TL;DR: In this paper, the authors describe the changes that were implemented in the new version of the COSPAR/URSI International Reference Ionosphere (IRI-2000), which greatly improves the representation at low and equatorial latitudes during high solar activities.

TL;DR: In this paper, the relationship between scintillation and ionospheric irregularities, characteristics of the equatorial and high-latitude irregularities in the context of space weather, and the application of alternative methods of data analysis, which provide a new insight into local properties of irregularities.

TL;DR: In this article, the authors used measurements of an ionosonde station near the magnetic equator in Ouagadougou, Burkina Faso to evaluate the ability of the International Reference Ionosphere (IRI) model to correctly represent ionospheric F2 peak parameters in this region.

TL;DR: A European strategy leading to a potential European participation in future human exploratory missions has been recommended and advanced life support systems with a high degree of autonomy and regenerative capacity and synergy effects were considered where bioregenerativeLife support systems and biodiagnostic systems become essential.

TL;DR: The Laser Interferometer Space Antenna (LISA) as discussed by the authors was designed to detect and observe gravitational waves from massive black holes, galactive binary stars, and violent events in the Universe in a frequency range from 10 −4 to 10 −1 Hz which is totally inaccessible to ground-based experiments.

TL;DR: In this article, the authors used 3 nm bandwidth observations over the growth cycle of wheat in 680-820 nm range, the point of inflection was identified through differentiation and it was at 729 nm corresponding to peak observed at 64 days after sowing (DAS).

TL;DR: The role of the Gnevyshev gap (a time interval in which a decrease in solar atmospheric activity is observed) in the time history of Space Weather parameters is discussed in this article.

TL;DR: It is shown that irradiation with high-energy particles produces age-like decrements in cognitive behavior that may impair the ability of astronauts to perform critical tasks during long-term space travel beyond the magnetosphere.

TL;DR: It is proclaimed that chronic exposure to elevated levels of radiation can considerably decrease radiation susceptibility and better protect astronauts against the unpredictable exposure to sudden and dramatic increase in flux due to solar flares and coronal mass ejections.

TL;DR: An overview over the Iono_WG activities is given to point out the importance of GPS for routine ionosphere monitoring and to realize near-real-time availability of IGS ionosphere products.

TL;DR: In this article, the authors measured the solar ultraviolet (UV) spectral irradiance (115-410 nm) since October 1991 and compared the UV irradiance variations during the two solar cycles.

TL;DR: The NASA Strategic Plan to accomplish the objectives of the Space Radiation Health Program in a manner consistent with the high priority assigned to the protection and health maintenance of crews will be presented.

TL;DR: Generally, for the missions under consideration, physicochemical regeneration is most cost effective, but bioregeneration is likely to be of use for producing salad crops for any mission, for producing staple crops for medium duration missions, and for most food, air and water regeneration for long missions.

TL;DR: In this article, a collaborative study between INPE and Cornell University has installed several Global Positioning System (GPS) based scintillation monitors over the Brazilian territory in order to study L Band scintillations.

TL;DR: In this article, the chirality of filaments and features in their environment are reviewed in preparation to discuss how some of the observational signatures of chiral have been differently interpreted as corresponding to either positive or negative helicity.

TL;DR: In this paper, the dependence of the L-position (Lmax) of the peak intensity of storm-injected relativistic electrons upon the magnetic storm amplitude |Dst|max was confirmed.

TL;DR: PTHrP represents a stretch-sensitive paracrine signaling mechanism that may sense gravity and may be corrected using chemical agents that up-regulate this pathway.

TL;DR: In this article, a cell culture module was developed for the International Space Station to provide further insight in the mechanism of mechanotransduction in bone, and the specific aim of the research project is to test whether near weightlessness decreases the sensitivity of bone cells for mechanical stress through a decrease in early signaling molecules (NO, PGs) that are involved in the mechanical loading-induced osteogenic response.

TL;DR: In this paper, the authors review the observations of large-scale patterns of helicity in solar atmosphere and their possible relationship with (sub-)photospheric processes, and show that these patterns of mixed helicity were observed at different spatial scales in each hemisphere.

TL;DR: In this article, the authors investigated the correlation between hmF2 and the equatorial F region vertical drift as given by the model of Scherliess and Fejer (1999), and found that the positive correlation found during nighttime could be helpful in representing the post-sunset peak of hm F2 that is currently not represented by IRI.

TL;DR: In this article, the solar cycle appears to be the dominant natural influence in the evolution of NLC activity, and there is an unexplained several-year time lag between solar cycle minimum and the peak of cloud activity.

TL;DR: In this article, the radial speed of the leading edge close to the center of these CMEs and the lateral expansion speed of these structures were measured, and a comparison of both speeds revealed a high correlation between them.

TL;DR: In this paper, the authors report on observations at Voyagers 1 and 2, in the outer heliosphere, of ions with energies ∼30 keV to 30 MeV, during the period of 2001 through 2002 DOY 268, during which both spacecraft observe significant variations in energetic ion intensities as large-scale plasma disturbances associated with intense periods of solar activity in 2000-2002 reach the outerheliosphere.