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Relativistic Fe Kα features in the XMM-Newton spectrum of the intermediate Seyfert galaxy 4U 1344-60
Bianchi, S.; Guainazzi, M.; Jiménez-Bailón, E. +6 more
We present the analysis of optical and X-ray XMM-Newton data of the source 4U 1344-60. On the basis of the optical data we propose to classify 4U 1344-60 as a Seyfert 1.5 galaxy and we measured a redshift value z=0.012±0.001. The observed X-ray spectrum is complex. The continuum emission can be described as a power law obscured by two neutral abso…
Modeling of Plasma Flow Around SMART-1 Spacecraft
Gengembre, E.; Markelov, G.
SMART-1 is the first European spacecraft that uses electric propulsion as the main propulsion system. The thruster characteristics and plasma measurements performed during SMART-1 mission lay a good foundation for understanding spacecraft/plasma interactions. This paper discusses the applications and modifications of spacecraft plasma interaction …
Noise induced on an electric antenna and its effective length in solar wind: Application to CLUSTER observations
Souček, J.; Santolík, O.; Chugunov, Yu. V. +1 more
Two problems related to the performance of an electric antenna in the solar wind are addressed. Namely, the noise induced on the antenna and its effective length at the close vicinity of the plasma resonance. The antenna is a double sphere dipole on the Cluster spacecraft and data are obtained from the WBD instrument. The noise data are interprete…
Maintenance of the link to Hipparcos
Zacharias, N.
The optical wavelength astrometric reference frame is currently based on observations made by the Hipparcos astrometric satellite. Unfortunately, since the Hipparcos Celestial Reference Frame (HCRF) is comprised of bright stars which are sparsely distributed on the sky, the frame often is inappropriate for astronomical and astrometric programs req…
The Magnetospheric Cusp: Structure and Dynamics
Balogh, A.; Zhang, H.; Zong, Q. -G. +7 more
Understanding the polar cusps is essential for a thorough understanding of the entire physics of the magnetosphere, and of the dynamical interaction between the solar wind and any planetary magnetosphere. Energetic electrons are unique to fully assess magnetic field-line topology and thus should be able to clearly delineate regions of open and clo…
INTEGRAL and XMM-Newton observations towards the unidentified MeV source GRO J1411-64
Barcons, X.; Reimer, O.; Torres, D. F. +9 more
Aims.We investigate the nature of the COMPTEL unidentified source GRO J1411-64. Methods: The source was observed by INTEGRAL. Its central part was also observed by XMM-Newton. Results: The data analysis shows no hint for new detections at hard X-rays. The upper limits in flux herein presented constrain the energy spectrum of whatever was producing…
Cluster observations of energetic ionospheric ion beams in the auroral region: Acceleration and associated energy-dispersed precipitation
Rème, H.; Dunlop, M.; Bosqued, J. M. +8 more
This paper presents a detailed study of the Feb. 14, 2001 Cluster northern auroral pass at mid-altitudes (4-5 RE), characterized by observations of a series of energy-dispersed ion structures in a region of poleward convection. In contradiction with one current view, that ions populating these energy-dispersed signatures originate spora…
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…