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Prelude to The Moon: Science, Technology, Utilization and Human Exploration
Ehrenfreund, P.; Foing, B. H.
A COSPAR 2-day symposium was dedicated to "The Moon: Science, Technology, Utilization and Human Exploration" at the COSPAR assembly in Paris, on 22-23 July 2004, sponsored by Planetary (B0.3), Life Sciences (F0.1) and Planetary Protection (PPP3) commissions, and ILEWG International Lunar Exploration Working Group. This was very timely to present t…
Active region AR484 tracking with Solar Feature Catalogue
Bentley, R. D.; Ipson, S.; Zharkova, V. +2 more
This paper presents a morphological analysis of the active region NOAA AR 484 as well as its intensity and magnetic field variations associated with flare occurrences. The active region is tracked during a one solar rotation with the automated technique used in Solar Feature Catalogue (SFC). The location and intensity parameters of region AR484 we…
Dense Spot Coverage and Polar Caps on SV Cam
Jeffers, S. V.; Barnes, J. R.; Aufdenberg, J. P. +1 more
We have used spectrophotometric data from nine Hubble Space Telescope orbits to eclipse-map the primary component of the RS CVn binary SV Cam. From these observations and its HIPPARCOS parallax we find that the surface flux in the eclipsed low-latitude region is about 30 % lower than computed from the best fitting PHOENIX model atmosphere. This fl…
Visual Orbit, Differential Photometry, and Dynamical Mass of DG Leo
Tamazian, Vakhtang S.
A new orbital solution with a significantly improved accuracy for the elements, differential photometry, and dynamical mass is presented for the visual binary DG Leo, which consists of a spectroscopic binary and a δ Scuti star. Some dynamical and astrophysical implications of the newly obtained results are discussed. In particular, due to possibly…
HST/ACS observations of Lyman-break galaxies and Lyα emitters associated with radio galaxies at z>4
Overzier, R. A.
Distant radio galaxies may pinpoint overdense regions in the early universe. We have collected data with HST/ACS towards several overdensities of Lyα emitters associated with radio galaxies discovered by Venemans et al. Using the Lyman break selection technique we find statistical evidence for additional galaxies associated with the radio galaxies…
Multiscale, multipoint measurements from Cluster: Advancing our scientific understanding of geospace
Escoubet, C. P.; Goldstein, M. L.; Laakso, H.
Cluster is the first multispacecraft mission with identical instrumentation designed to resolve spatial and temporal structures in geospace. The orbits of the four Cluster spacecraft are variable and are adjusted periodically to place the spacecraft into configurations that optimize the three-dimensional capabilities of the instrumentation. During…
XMM-Newton observations of faint X-ray sources in globular clusters
Webb, N. A.; Barret, D.; Gendre, B.
Using the new generation of X-ray observatories, we are now beginning to identify populations of close binaries in globular clusters, previously elusive in the optical domain because of the high stellar density. These binaries are thought to be, at least in part, responsible for delaying the inevitable core collapse of globular clusters and their …
The hard X-ray emission from the Vela pulsar wind nebula
Cusumano, G.; Bocchino, F.; Mineo, T. +2 more
We present the results of a preliminary spectral analysis performed on the BeppoSAX and XMM observations of the Vela plerion. The broad energy range covered by the instruments on board the two observatories allows an evaluation of the spectral parameters of the high energy emission model and provides an indication on the morphology of the source e…
The effect of a dense atmosphere on the tidally induced potential of Titan
Karatekin, Özgür; van Hoolst, Tim
The effect of the dense atmosphere of Titan on the tidal variations of the external gravitational potential of degree two is quantified. The atmospheric tides perturb the external gravitational potential of Titan in two ways. First, the atmosphere itself contributes directly to the external gravitational potential with a period of 15.945 days. Sec…
Alfvénic turbulence in solar wind originating near coronal hole boundaries: heavy-ion effects?
Bavassano, B.; Pietropaolo, E.; Bruno, R. +1 more
The mid-latitude phases of the Ulysses mission offer an excellent opportunity to investigate the solar wind originating near the coronal hole boundaries. Here we report on Alfvénic turbulence features, revealing a relevant presence of in-situ generated fluctuations, observed during the wind rarefaction phase that charaterizes the transition from f…