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Statistical altitude distribution of Cluster auroral electric fields, indicating mainly quasi-static acceleration below 2.8 RE and Alfvénic above
Karlsson, T.; Li, B.; Masson, A. +3 more
Results are presented from a statistical study of high-altitude electric fields and plasma densities using Cluster satellite data collected during 9.5 years between 2 and 4 RE. The average electric fields are most intense on the nightside and associated with an extensive plasma density cavity, with densities of 1 cm-3 or less…
Case study of climatic changes in Martian fluvial systems at Xanthe Terra
Kereszturi, Akos
An unnamed valley system was analyzed in Xanthe Terra south of Havel Vallis on Mars where three separate episodes of fluvial activity could be identified with different morphology, water source and erosional processes, inferring formation under different climatic conditions. The oldest scattered valleys (1. group) form interconnecting network and …
Kinetic model of Janaki et al.'s bifurcated current sheet
Dasgupta, B.; Yoon, P. H.; Janaki, M. S.
Space satellite observations show that current sheets in the space plasma environment are often characterized by bifurcated structures. In a recent paper a two-fluid model of the bifurcated current sheet was constructed on the basis of the pseudo potential method. A straightforward generalization of Janaki et al.'s two-fluid model to kinetic forma…
Two numerical models designed to reproduce Saturn ring temperatures as measured by Cassini-CIRS
Altobelli, Nicolas; Flandes, A.; Leyrat, C. +7 more
We present two numerical models designed to reproduce the temperatures of the illuminated Saturn rings as measured by the CASSINI-CIRS instrument. Our models are constrained by all available temperature measurements performed on the illuminated rings since SOI. Both models reproduce well the variations of temperature under any illumination and obs…
Spectroscopic analysis of four post-AGB candidates
Pereira, C. B.; Arellano Ferro, A.; Muneer, S. +2 more
We have done a detailed abundance analysis of four unexplored candidate post- Asymptotic Giant Branch(AGB) stars IRAS 13110 - 6629, IRAS 17579 - 3121, IRAS 18321 - 1401 and IRAS 18489 - 0629 using high resolution spectra. We have constructed Spectral Energy Distributions (SED) for these objects using the existing photometric data combined with inf…
Constraints on the galaxy `main sequence' at z > 5: the stellar mass of HDF850.1
Serjeant, Stephen; Marchetti, Lucia
We present rest-frame optical and near-infrared detections of one of the highest redshift submm-selected galaxies to date, HDF850.1. We do not detect the previously proposed counterpart HDF850.1K in new deep J- and H-band Hubble Space Telescope Wide Field Camera 3 data, placing a strong limit of H - K > 3.8, concluding that the K-band source is…
Testing the asymmetric cone model for halo CMEs using STEREO/SECCHI coronagraphic observations
Michalek, Grzegorz; Nicewicz, Janusz
Space weather is significantly controlled by halo coronal mass ejections (HCMEs) originating close to the central meridian and directing toward the Earth. Unfortunately, coronagraphic observations (especially for HCMEs) are subject to a projection effect which makes it impossible to determine the true radial velocity and width of CMEs. However, th…
New near-infrared observations and lens-model constraints for UM673
Chen, W. P.; Koptelova, E.; Chiueh, T. +1 more
Aims: We performed a detailed photometric analysis of the lensed system
Methods: High-resolution adaptive optics images of
Simulated measurements of 67P/Churyumov-Gerasimenko dust coma at 3 AU by the Rosetta GIADA instrument using the GIPSI tool
Fulle, M.; Altobelli, N.; Della Corte, V. +7 more
GIADA (Grain Impact Analyzer and Dust Accumulator) is an in situ instrument, on board the Rosetta spacecraft, designed to measure the dynamical properties of the dust grains emitted by the comet 67P/Churiumov-Gerasimenko (hereafter 67P/C-G). It consists of three subsystems able to measure the mass and speed of single dust grain and dust mass flux.…
In-flight calibration of the Hot Ion Analyser on board Cluster
Dandouras, I.; Facskó, G.; Barthe, A. +3 more
The Hot Ion Analyser (HIA), part of the Cluster Ion Spectrometry experiment, has the objective to measure the three-dimensional velocity distributions of ions. Due to a variety of factors (exposure to radiation, detector fatigue and aging, changes in the operating parameters, etc.), the particles' detection efficiency changes over time, prompting …