Search Publications
Characterization of waves in the vicinity of an interplanetary directional discontinuity
Dandouras, I.; Lucek, E. A.; Tjulin, A.
Directional discontinuities are frequently encountered in the solar wind. This study utilizes the possibility of simultaneous four-point measurements that the Cluster satellites provide for an investigation of the waves near one such interplanetary discontinuity event. In particular, the k-filtering technique has for the first time been applied fo…
Solar Wind Modulation of Jupiter Dust Stream Detection
Flandes, A.; Krueger, H.
During late 2002 and mid 2005, the Ulysses spacecraft approached Jupiter ( 0.8 AU at its closest distance) and detected 28 new Jovian dust particle streams. The tiny positively charged dust grains ( 10 nm) in the streams are accelerated away from Jupiter by its corotational electric field to very high speeds (greater than 200 km s^{-1}). Data indi…
EROs found behind lensing clusters. I. Stellar populations and dust properties of optical dropout EROs and comparison with related objects
Kneib, J. -P.; Schaerer, D.; Pelló, R. +6 more
Context: On the nature, redshift, stellar populations and dust properties of optically faint or non-detected extremely red objects.
Aims: Determining the nature, redshift, stellar populations and dust properties of optically faint or non-detected, extremely red objects (ERO) found from our survey of the lensing clusters A1835 and AC114 (Richar…
Scientific Planning and Commanding of the Rosetta Payload
Koschny, D.; Davidsson, B.; Ho, T. -M. +7 more
ESA’s Rosetta mission was launched in March 2004 and is on its way to comet 67P/Churyumov-Gerasimenko, where it is scheduled to arrive in summer 2014. It comprises a payload of 12 scientific instruments and a Lander. All instruments are provided by Principal Investigators, which are responsible for their operations. As for most ESA science mission…
Faint quasar candidates from Hubble Space Telescope imaging: number counts from 31 new high-latitude fields
Anderson, Scott F.; Beck-Winchatz, Bernhard
Quasars representative of the populous faint end of the luminosity function are dim with m ~ 24 at intermediate redshift, and traditional ground-based surveys for such faint quasars often suffer from severe contamination by compact faint galaxies. In order to limit the latter morphological contamination, we are conducting a combined multicolour an…
Space weather and deep space communications
Woo, Richard
While Pioneer 11 and Galileo are two deep space missions that experienced radio communication disruptions due to space weather, the success of a mission like Solar Probe, whose goal is to fly by the Sun within a few solar radii of its surface, may depend critically on space weather. It is therefore crucial to thoroughly understand how space weathe…
Present status and future challenges of modeling the Sun Earth end-to-end system
Baker, D. N.; Weigel, R. S.; Elkington, S. R. +1 more
Several research groups are presently modeling key portions of the solar terrestrial environment. Large-scale models of the solar corona, of the interplanetary medium, and of the coupled magnetosphere ionosphere system are providing important insights into the dynamics and temporal evolution of these regions during normal, as well as disturbed, co…
Probability of Field-Aligned Currents Observed by the Satellite Cluster in the Magnetotail
Liu, Zhen-Xing; Shi, Jian-Kui; Cheng, Zheng-Wei +1 more
Field-aligned current (FAC) density distribution at the plasma sheet boundary layers is statistically studied. The FAC is calculated by the so-called curlometer technique with the data from FGM onboard the four Cluster spacecraft in 2001. By calculation we obtain a large number of FAC samples. In the samples, most of calculated FAC densities were …
Evidence for enhanced hydration on the northern flank of Olympus Mons, Mars
Bibring, Jean-Pierre; Langevin, Yves; Poulet, François +7 more
In this paper we report about a small region on the northern scarp of Olympus Mons showing an increase of the 3 µm hydration band in the OMEGA spectra, together with low superficial temperatures. Although water ice clouds can occurs on the flank of big martian volcanoes, radiative transfer modeling indicates that atmospheric water ice alone …
A statistical study on the relationship between surface field variation and CME initiation
Zhang, H. Q.; Zhang, Y.; Zhang, M.
In order to understand whether coronal mass ejections (CMEs) can be related to changes in the longitudinal photospheric magnetic field, we study 51 CME-producing active regions (ARs) which are associated with 77 halo CMEs during the period of their solar disk passage. We look at the magnetic field evolution during the short-term of 12 h before CME…