Search Publications
SMART-1 highlights and relevant studies on early bombardment and geological processes on rocky planets
Grande, M.; Koschny, D.; Mall, U. +16 more
We present results from SMART-1 science and technology payload, in the context of the Nobel symposium on 'Physics of Planetary Systems'. SMART-1 is Europe' first lunar mission (Foing et al 2000 LPSC XXXI Abstract #1677 (CDROM); Foing et al 2001 Earth, Moon Planets 85 86 523 31 Marini et al 2002 Adv. Space Res. 30 1895 900 Racca et al 2001 Earth Mo…
Planetary transits from CoRoT—Europe and exoplanets
Fridlund, C. V. M.
CoRoT (COnvection, ROtation and planetary Transit) was launched successfully into a near-perfect orbit on 27 December 2006 and went through its verification phase until 2 April 2007 without incident. Indeed, this process went so well that scientific operations could commence on 2 February 2007. Under the management of the French space agency CNES …
How unique is the local region of the Galaxy disk?
Heiter, U.; Luck, R. E.
We present the results of a spectroscopic study of over 500 dwarf and giant stars within 100 pc of the Sun. Using stellar metallicity data, the goal of this study is to determine whether there are any significant variations of metallicity related to stellar characteristics or location in the Galaxy. The abundance data are based on high-resolution …
Dynamics and characteristics of electric-field structures in the auroral return current region observed by Cluster
André, M.; Buchert, S.; Kistler, L. M. +5 more
The temporal evolution and other characteristics of intense quasi-static electric fields in the return current region are discussed using Cluster observations. A narrow-scale, divergent electric field, the high-altitude signature of a positive U-shaped potential structure, was observed at the poleward edge of the central plasma sheet, close to mag…
Dispersive Alfvén Waves Observed by Cluster at the Magnetopause
Khotyaintsev, Y.; Stasiewicz, K.; Grzesiak, M.
We have analyzed ELF turbulence ∼0.03 - 10 Hz) observed by Cluster at the magnetopause layer during 120 multiple magnetopause crossings on a single event, December 31, 2000, 09-16 UT. Multiple crossings are produced by nonlinear, large amplitude surface waves at the magnetopause. Waves below the proton gyrofrequency fci ≈ 0.3 Hz) are identified as…
The New Sun - Probing Solar Plasmas with the SUMER Instrument on SOHO
Curdt, W.
With the SUMER (Solar Ultraviolet Measurements of Emitted Radiation) spectrometer on SOHO we observe the solar atmosphere with high spectral, spatial, and temporal resolution in the 400 to 1600 Å wavelength range. Selected observational facts are presented. Among these are points concerning the solar EUV spectrum in general, such as line identific…
Stellar chemical abundances with the GHRS.
Leckrone, D. S.; Wahlgren, G. M.; Johansson, S. +2 more
The accurate quantitative analysis of high resolution ultraviolet spectra of ultra-sharp-lined, early-type, chemically peculiar stars, obtained with the Goddard High Resolution Spectrograph on the Hubble Space Telescope, has been made possible by the synergism between state-of-the-art astrophysics and state-of-the-art atomic spectroscopy. The auth…
The preparation and use of atomic data for the SOHO mission.
Lang, J.
An overview of the SOHO mission is given, including brief descriptions of the major spectroscopic instruments CDS and SUMER. The range of ions whose spectra will be observed is discussed in the context of available fundamental atomic data, principally energy levels, transition probabilities and electron excitation rate coefficients. The use of ADA…
High resolution UV stellar spectroscopy with the HST/GHRS, challenges and opportunities for atomic physics.
Leckrone, D. S.; Wahlgren, G. M.; Johansson, S. +1 more
The Goddard High Resolution Spectrograph (GHRS) on the Hubble Space Telescope (HST) is producing ultraviolet spectra of unprecedented resolution and photometric quality. The authors illustrate this with observations of the ultra-sharp-lined, chemically peculiar B-type star, χ Lupi. The photosphere of this star is rich in heavy elements, and its UV…
The European X-ray Astronomy Satellite EXOSAT: programme status.
Peacock, A.
The current status of the European X-ray Astronomy Satellite programme, EXOSAT, which includes the payload, spacecraft and ground segment are summarised. Details of the experiment performances and sensitivities are provided.