Search Publications
Spacecraft charging near Enceladus
Kempf, S.; Grün, E.; Hsu, H. -W. +1 more
In the vicinity of Enceladus, a geologically active moon of Saturn, the modeled spacecraft potential is significantly more negative than indicated by the Cassini Langmuir probe measurements. To understand this potential difference, we introduce two new dust-related charging currents: a) the dust ram current; and b) the dust impact-plasma current, …
Type Ia supernovae in globular clusters: observational upper limits
Nelemans, G.; Voss, R.
Aims: In the dense stellar environment of globular clusters it is expected that compact binaries can be produced dynamically. This in turn would mean that the fraction of type Ia supernovae that will explode in globular clusters will be higher than would be expected from the mass of stars present. Therefore we wish to determine observational …
Long-Term Variation of the Corona in Quiet Regions
Mariska, J. T.; Kamio, S.
Using Hinode EUV Imaging Spectrometer (EIS) spectra recorded daily at Sun center from the end of 2006 to early 2011, we studied the long-term evolution of the quiet corona. The light curves of the higher temperature emission lines exhibit larger variations in sync with the solar activity cycle while the cooler lines show reduced modulation. Our st…
Application of Support Vector Machine to the Prediction of Geo-Effective Halo CMES
Moon, Yong-Jae; Park, Young-Deuk; Choi, Seong-Hwan +1 more
The abundance of H2 in Titan's troposphere from the Cassini CIRS investigation
Gautier, Daniel; Kim, Sang Joon; Courtin, Régis +1 more
We derived the mole fraction of H2 in the troposphere of Titan from an analysis of the H2-N2 dimer S0(0) rotational transition seen near 355 cm-1 in spectra recorded by the Composite Infra-Red Spectrometer (CIRS) on the Cassini spacecraft between March 2006 and February 2007. We find a globall…
On the massive young stellar object AFGL 4176. High-spatial-resolution multi-wavelength observations and modeling
Henning, T.; van Boekel, R.; Bouwman, J. +3 more
Deeply embedded and at distances of several kiloparsecs, massive young stellar objects (MYSOs) present numerous challenges for observation and study. In this work, we present spatially-resolved observations of one MYSO, AFGL 4176, together with survey and literature data, ranging from interferometric observations with VLTI/MIDI in the mid-infrared…
Aggregates in the strength and gravity regime: Particles sizes in Saturn's rings
Albers, Nicole; Spahn, Frank; Seiß, Martin +3 more
Particles in Saturn's main rings range in size from dust to kilometer-sized objects. Their size distribution is thought to be a result of competing accretion and fragmentation processes. While growth is naturally limited in tidal environments, frequent collisions among these objects may contribute to both accretion and fragmentation. As ring parti…
Simulation of Potential Measurements Around a Photoemitting Spacecraft in a Flowing Plasma
Eriksson, Anders I.; Sjogren, Alexander; Cully, Christopher M.
Rosetta visits asteroid (21)Lutetia
Ferri, P.; Lodiot, S.; Accomazzo, A. +3 more
The International Rosetta Mission, cornerstone of the European Space Agency Scientific Programme, was launched on 2nd March 2004 to its 10 years journey to comet Churyumov-Gerasimenko. Rosetta will reach the comet in summer 2014, orbit it for about 1.5 years down to distances of a few Kilometres and deliver the Lander Philae onto its surface. Afte…
Calculations of N 2 triplet states vibrational populations and band emissions in venusian dayglow
Bhardwaj, Anil; Jain, Sonal Kumar
A model for N 2 triplet states band emissions in the venusian dayglow has been developed for low and high solar activity conditions. Steady state photoelectron fluxes and volume excitation rates for N 2 triplet states have been calculated using the Analytical Yield Spectra (AYS) technique. Model calculated photoelectron flux …