Showing papers in "Advances in Space Research in 2008"

TL;DR: The International Reference Ionosphere (IRI) is the de facto international standard for the climatological specification of ionospheric parameters and as such it is currently undergoing registration as Technical Specification (TS) of the International Standardization Organization (ISO) as discussed by the authors.

TL;DR: Several kinds of decision trees for finding active objects by multi-wavelength data, such as REPTree, Random Tree, Decision Stump, Random Forest, J48, NBTree, AdTree are described and experimental results show that ADTree is the best only in terms of accuracy.

TL;DR: The Swarm mission as mentioned in this paper was selected as the 5th mission in ESA's Earth Explorer Programme in 2004 and measured the Earth's magnetic field with unprecedented accuracy, including both magnetic fields and currents in the Earth interior and electrical currents in Geospace.

TL;DR: In this article, a new study has been conducted in the Orbital Debris Program Office at the NASA Lyndon B. Johnson Space Center, using higher fidelity models to evaluate the current debris environment.

TL;DR: The Mars Express spacecraft carries a low-frequency radar called MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) that is designed to study the subsurface and ionosphere of Mars as mentioned in this paper.

TL;DR: An alternative implementation technique for SVM to address the classification problem with small-size training sample set is introduced and it has been empirically proven that the effectiveness of the introduced implementation technique has been evaluated by benchmark datasets.

TL;DR: The Japanese lunar mission SELENE (SELenological and Engineering Explorer) has been in development to target launch scheduled 2007 summer by H-IIA rocket as discussed by the authors.

TL;DR: In this article, the authors identify and analyse numerous acceleration spikes related to switching activity in the circuits of onboard heaters and derive average models for the switching spikes and use them to construct a synthetic spike time series, based on preliminary modeling results, they expect at most a slight influence of the acceleration spikes on the GRACE gravity field determination.

TL;DR: In this article, the authors used two-line element (TLE) orbit data to calibrate the parameters of a neutral density model with a latency of one to two days.

TL;DR: In this paper, a self-similar solution of the equation of non-linear diffusion for particles ejected from a supernova source is presented, and the results may change the physical picture of cosmic ray propagation in the Galaxy.

TL;DR: In this paper, the suitability of satellite platform sensors in estimating grassland biophysical parameters such as LAI, biomass, phytomass, and Green herbage ratio (GR) was tested.

TL;DR: In this article, the authors evaluated pure sulfur and two sets of small sulfur concrete samples that have been prepared using JSC-1 lunar stimulant and SiO2 powder as aggregate additions.

TL;DR: In this article, the authors present an overview and discussion of the various effects of hypervelocity impacts from small particles, including the structural damage, indirect disturbances, and electrostatic discharges of pre-charged surfaces.

TL;DR: In this paper, the problem of initial reduction of CCD observations of faint GEO objects is studied, and several difficulties and questions arising in connection with image processing for this kind of observations are mentioned.

TL;DR: In this article, a joint team of researchers under the auspices of the Center for Space Debris Information Collection, Processing and Analysis of the Russian Academy of Sciences collaborates with 15 observatories around the world to perform observations of space debris.

TL;DR: In this paper, the authors make an analysis of significant periodicities shown by phenomena linked to solar activity such as coronal hole area, radio emission in the 10.7 cm band and sunspots.

TL;DR: In this article, the nature of the climatic response to solar variability is assessed over a long-time scale using wavelet analysis applied to paleoclimatic proxy data of large scale atmospheric phenomena.

TL;DR: In this article, a new empirical Ballistic Limit Equation (BLE) was derived from an existing Whipple-shield BLE, which provided a good level of accuracy in predicting the ballistic performance of stand-alone sandwich panels.

TL;DR: In this article, the authors present different multi-dimensional approaches for modeling spatio-temporal variations of the ionospheric electron density, where the target function is split into a reference part, computed from the International Reference Ionosphere (IRI), and an unknown correction term.

TL;DR: In this article, the authors discussed two aspects of electrostatic solitary wave (ESW) propagation in the magnetosheath and in the auroral acceleration (upward current) region.

TL;DR: Insects could be useful both from an ecosystem design point of view, as well as serving as a protein-rich food for human occupants, and can also fulfill other useful ecological roles.

TL;DR: In this article, the performance of GA-PLS coupled with partial least squares (GAPLS) modeling of spectral reflectance in retrieving equivalent water thickness (EWT) at leaf and canopy level was investigated.

TL;DR: A framework for objective evaluation of CDAs is proposed and possible extensions with additional test-field subsystems based on visual images, data sets for other planets, evaluation methodologies for CDAs developed for different purposes than cataloguing of craters, are proposed.

TL;DR: In this article, a solar activity forecasting model supported with an artificial neural network is introduced, which is equivalent to a person with a long period of solar flare forecasting experience, which can be used to forecast solar activity.

TL;DR: The National Aeronautics and Space Administration (NASA) and the National Federation of the Blind's (NFB) National Center for Blind Youth in Science (NCBYS) as mentioned in this paper developed and implemented strategies to promote opportunities for blind youth in science, including tactile space science books and curriculum materials, science academies for blind middle school and high school students, and college-level internship and mentoring programs.

TL;DR: In this paper, a semi-analytical theory of order 1 regarding the averaging process for geosynchronous space debris under gravitational influence is presented. But the analysis is based on an expansion in powers of the eccentricity and of the inclination, truncated at an arbitrary high order.

TL;DR: Wang et al. as discussed by the authors reviewed the remote sensing research in Chinese seas within the period of 24 years from 1978 to 2002 and further discussed on the applications of satellite remote sensing in the fields of harmful algal blooms (HABs), primary production and physical oceanographic currents of the regional seas.

TL;DR: In this article, the effect of seasonal and geomagnetic effects on the ionospheric total electron content (TEC) in the northern hemispheric equatorial ionosphere anomaly (EIA) region is studied by analyzing dual-frequency signals of the Global Position System (GPS) acquired from a chain of nine observational sites clustered around Taiwan (21.9-26.2°N, 118.4-112.6°E).

TL;DR: PAMELA as discussed by the authors is a satellite-borne experiment designed to study with great accuracy cosmic rays of galactic, solar, and trapped nature in a wide energy range (protons 80 −MeV-700 −GeV, electrons 50 −MEV-400 �GeV).

TL;DR: In this paper, total electron content (TEC) measurements along slant paths connecting GPS receivers and satellites at 22,000 km have become the largest data set available to ionospheric scientists.