Search Publications
Prelaunch performance evaluation of the cometary experiment MUPUS-TP
Kührt, E.; Knollenberg, J.; Spohn, T. +13 more
This paper discusses test results obtained in both laboratory and terrestrial environment conditions for the ``Multipurpose Sensors for Surface and Sub-Surface Science'' Thermal Probe (MUPUS-TP), which has been developed for the European Space Agency Rosetta cometary rendezvous mission. The probe is intended to provide in situ long-term observatio…
A stratospheric balloon experiment to test the Huygens atmospheric structure instrument (HASI)
Patel, M. R.; Fulchignoni, M.; Hathi, B. +15 more
We developed a series of balloon experiments parachuting a 1:1 scale mock-up of the Huygens probe from an altitude just over 30 km to simulate at planetary scale the final part of the descent of the probe through Titan's lower atmosphere. The terrestrial atmosphere represents a natural laboratory where most of the physical parameters meet quite we…
Modulation in the solar irradiance due to surface magnetism during cycles 21, 22 and 23
Jain, K.; Hasan, S. S.
Magnetic field indices derived from synoptic magnetograms of the Mt. Wilson Observatory, i.e. Magnetic Plage Strength Index (MPSI) and Mt. Wilson Sunspot Index (MWSI), are used to study the effects of surface magnetism on total solar irradiance variability during solar cycles 21, 22 and 23. We find that most of the solar cycle variation in the tot…
XMM-Newton spectra of hard spectrum Rosat AGN: X-ray absorption and optical reddening
Page, M. J.; Carrera, F. J.; Mittaz, J. P. D.
We present the XMM-Newton spectra of three low-redshift intermediate Seyferts (one Sy 1.5, and two Sy 1.8), from our survey of hard spectrum Rosat sources. The three AGN are well fitted by absorbed powerlaws, with intrinsic nuclear photoelectric absorption from column densities between 1.3 and 4.0 × 1021 cm-2. In the brightes…
INTEGRAL observation of 3EG J1736-2908
Gehrels, N.; Grandi, P.; Chaty, S. +10 more
The possible identification by INTEGRAL of the EGRET source 3EG J1736-2908 with the active galactic nucleus GRS 1734-292 is discussed. The latter was discovered in 1990 and later identified with a Seyfert 1 galaxy. At the time of the compilation of the 3rd EGRET Catalog, it was not considered as a possible counterpart of the source 3EG J1736-2908,…
Scientific objectives and selection of targets for the SMART-1 Infrared Spectrometer (SIR)
Keller, H. U.; Hiesinger, H.; Mall, U. +3 more
The European SMART-1 mission to the Moon, primarily a testbed for innovative technologies, was launched in September 2003 and will reach the Moon in 2005. On board are several scientific instruments, including the point-spectrometer SMART-1 Infrared Spectrometer (SIR). Taking into account the capabilities of the SMART-1 mission and the SIR instrum…
Ongoing Mass Transfer in the Interacting Galaxy Pair NGC 1409/1410
Keel, William C.
I present two-band Hubble Space Telescope (HST) STIS imaging and WIYN spectral mapping of ongoing mass transfer in the interacting galaxy pair NGC 1409/1410 (where NGC 1410 is the Seyfert galaxy also cataloged as III Zw 55). Archival snapshot WFPC2 imaging from the survey by Malkan and coworkers showed a dust feature stretching between the galaxie…
An estimate of the D/H ratio in Jupiter and Saturn's regular icy satellites - Implications for the Titan Huygens mission
Mousis, O.
The solar nebula model described by Dubrulle (\cite{Dubrulle1993}) and Drouart et al. (\cite{Drouart1999}) is used to predict the D/H ratio in H2O ice of both Jovian and Saturnian regular satellite systems. These calculations take into account recent scenarios of formation of Jupiter and Saturn's large regular icy satellites developed f…
Study of Flare-Associated X-Ray Plasma Ejections : II. Morphological Classification
KIM, YEON-HAN; MOON, Y. -J.; CHO, K. -S. +2 more
The photospheric boundary of Sun-to-Earth coupled models
Linker, J. A.; Mikić, Z.; Fisher, G. H. +3 more
The least understood component of the Sun-to-Earth coupled system is the solar atmosphere—the visible layers of the Sun that encompass the photosphere, chromosphere, transition region and low corona. Coronal mass ejections (CMEs), principal drivers of space weather, are magnetically driven phenomena that are thought to originate in the low solar c…