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Preliminary study of Venus cloud layers with polarimetric data from SPICAV/VEx
Montmessin, Franck; Bertaux, Jean-Loup; Korablev, Oleg +4 more
We present unique polarization data from the SPICAV-IR spectrometer onboard ESA's Venus Express (VEx) spacecraft and a first retrieval of cloud parameters. The polarization data have been collected from 2006 to 2010, and cover mostly the northern hemisphere, in the 0.65 to 1.7 µm spectral range. They contain information about latitudinal and…
Polytropic index of central plasma sheet ions based on MHD Bernoulli integral
Ma, Yuduan; Wang, Jing; Cao, Jinbin +8 more
This paper uses the data of Cluster from 2001 to 2009 to study the polytropic processes of central plasma sheet (CPS) ions. We first adopt the approach of MHD Bernoulli integral (MBI) to identify homogeneous streamflow tubes (quasi-invariant MBI regions) and then calculate the polytropic index of ions for those streamflow tubes whose outward elect…
Enceladus’ Geysers: Relation to Geological Features
Porco, Carolyn C.; Helfenstein, Paul
We apply histogram analysis, photogeological methods, and tidal stress modeling to Porco et al.'s survey of 101 Enceladus South Polar Basin geysers and their three-dimensional orientations to test if the jet azimuths are influenced by their placement relative to surface morphology and tectonic structures. Geysers emplaced along the three most acti…
The JCMT Gould Belt Survey: evidence for radiative heating in Serpens MWC 297 and its influence on local star formation
Stapelfeldt, K. R.; White, G. J.; Wilson, C. D. +61 more
We present SCUBA-2 450 and 850 µm observations of the Serpens MWC 297 region, part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey of nearby star-forming regions. Simulations suggest that radiative feedback influences the star formation process and we investigate observational evidence for this by constructing temperature maps.…
CMB power spectrum of Nambu-Goto cosmic strings
Shellard, E. P. S.; Landriau, Martin; Lazanu, Andrei
We improve predictions of the cosmic microwave background (CMB) power spectrum induced by cosmic strings by using source terms obtained from Nambu-Goto network simulations in an expanding universe. We use three high-resolution cosmic string simulations that cover the entire period from recombination until late-time Λ domination to calculate unequa…
Saturn´s Inner Satellites: Orbits, Masses, and the Chaotic Motion of Atlas from New Cassini Imaging Observations
Cooper, N. J.; Murray, C. D.; Evans, M. W. +1 more
We present numerically derived orbits and mass estimates for the inner Saturnian satellites, Atlas, Prometheus, Pandora, Janus, and Epimetheus from a fit to 2580 new Cassini Imaging Science Subsystem astrometric observations spanning 2004 February to 2013 August. The observations are provided as machine-readable and Virtual Observatory tables. We …
Imaging and Spectroscopic Observations of a Transient Coronal Loop: Evidence for the Non-Maxwellian K Distributions
Del Zanna, Giulio; Dudík, Jaroslav; Dzifčáková, Elena +8 more
We report on the Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA) and Hinode/EUV Imaging Spectrograph (EIS) observations of a transient coronal loop. The loop brightens up in the same location after the disappearance of an arcade formed during a B8.9-class microflare 3 hr earlier. EIS captures this loop during its brightening phase, a…
Seasonal variation of the HDO/H2O ratio in the atmosphere of Mars at the middle of northern spring and beginning of northern summer
Aoki, Shohei; Kasaba, Yasumasa; Sagawa, Hideo +4 more
We present the seasonal variation of the HDO/H2O ratio caused by sublimation-condensation processes in a global view of the martian water cycle. The HDO/H2O ratio was retrieved from ground-based observations using high-dispersion echelle spectroscopy of the Infrared Camera and Spectrograph (IRCS) of the Subaru telescope. Coor…
Water vapor near Venus cloud tops from VIRTIS-H/Venus express observations 2006-2011
Drossart, P.; Piccioni, G.; Ignatiev, N. I. +1 more
This work aims to give a summary of the water vapor at the cloud top of Venus atmosphere using the complete set of observations made using high spectral resolution channel (-H) of Visible and Infrared Thermal Imaging Spectrometer (VIRTIS), on board the ESA Venus Express orbiter, to measure the cloud top altitude and the water vapor abundance near …
Observation of charged nanograins at comet 67P/Churyumov-Gerasimenko
Goldstein, R.; Mokashi, P.; Gombosi, T. I. +2 more
Soon after the Rosetta Orbiter rendezvoused with comet 67P/Churyumov-Gerasimenko at a solar distance of ~3.5 AU and began to fly in triangular-shaped trajectories around it, the Ion and Electron Sensor detected negative particles at energies from about 100 eV/q to over 18 keV/q. The lower energy particles came from roughly the direction of the com…