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Polarization of Saturn's moon Iapetus. II. Comparison of the dark and the bright sides
Muinonen, K.; Tozzi, G. P.; Boehnhardt, H. +3 more
Context. The surface properties of atmosphereless solar system objects can be constrained by investigating the nature of the polarized light scattered from their surfaces.
Aims: We provide new and precise measurements of the phase angle and the wavelength dependence of linear polarization on the leading side of Iapetus over the maximum phase …
Magnetic interconnection of Saturn's polar regions: comparison of modelling results with Hubble Space Telescope UV auroral images
Belenkaya, E. S.; Cowley, S. W. H.; Kalegaev, V. V. +2 more
We consider the magnetic interconnection of Saturn's northern and southern polar regions controlled by the interplanetary magnetic field (IMF), studying in particular the more complex and interesting case of southward IMF, when the Kronian magnetospheric magnetic field structure is the most twisted. The simpler case of northward IMF is also discus…
Plasma processes at comet Churyumov-Gerasimenko: Expectations for Rosetta
Mendis, D. A.; Horányi, M.; Horányi
The Rosetta-Philae mission to comet 67P/Churyumov-Gerasimenko in 2014 will provide a unique opportunity to observe the variable nature of the interaction of a comet with the solar radiation and the solar wind, as the comet approaches the Sun. In this short paper we will focus on the varying global structure of the cometary plasma environment. Spec…
Martian atmospheric particulate spectral end-members recovery from PFS and IRIS data
Palomba, Ernesto; Zinzi, Angelo; Helbert, Jörn +2 more
We present an application of a multivariate analyses technique on data returned by the Planetary Fourier Spectrometer (PFS) instrument on board the ESA’s Mars Express (MEX) spacecraft in order to separate the atmospheric contribution from the observed radiation. We observe that Thermal/Far Infrared spectra returned from Mars, covering almost a who…
Photospheric Stratification of a Central Umbral Dot Using Stokes Profiles Recorded by Hinode: A Different Single-Case Study
Hamedivafa, H.
We aim to study the physical nature of a central umbral dot (UD) close to disk center by analyzing full-Stokes spectra of the two Fe I lines at 630 nm recorded by the spectropolarimeter on Hinode. Thermal and magnetic properties of the UD were directly inferred from Stokes profiles. Then, we applied the inversion code SIR to retrieve a single-comp…
Probing the fast outflow in IRAS 15452 - 5459 with ATCA observations of OH, H2O and SiO masers
Menten, K. M.; Cerrigone, L.; Wiesemeyer, H.
Maser lines of OH, H2O and SiO are commonly observed in O-rich asymptotic giant branch (AGB) stars, but their presence after the end of the AGB phase is linked to non-spherical mass-loss processes. IRAS 15452 - 5459 is a post-AGB star with an hourglass nebula whose maser lines are quite peculiar. We observed all of the three maser speci…
Interstellar Absorption Lines in the Direction of the Cataclysmic Variable SS Cygni
Ritchey, Adam M.; Wallerstein, George; McKeever, Jean
Not Available
Based on observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium, and on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Mikulski Archive for Space Telescopes. STScI is operated by the Association of Universities f…Intensities of the Venusian N2 electron-impact excited dayglow emissions
Fox, Jane L.; F. Hać, Nicholas E.
Dayglow emissions are signatures of both the energy deposition into an atmosphere and the abundances of the species from which they arise. The first N2 dayglow emissions from Mars, the (0,5) and (0,6) bands of the N2 Vegard-Kaplan band system, were detected by the Spectroscopy for Investigations of the Characteristics of the …
X-ray study of clusters at the outer edge and beyond
Akamatsu, H.; Ohashi, T.; Takei, Y. +2 more
We report on recent Suzaku results on cluster outer regions. Relaxed clusters show a monotonous temperature decline to the virial radii, reaching 1/3 to 1/4 of the central levels. Significant temperature jumps have been confirmed for a number of radio relics, including A 3667, A 3376, and CIZA J2242.8+5301. This confirms that the radio relics gene…
INTEGRAL/SPI data segmentation to retrieve source intensity variations
Bouchet, L.; Chauvin, M.; Amestoy, P. R. +2 more
Context. The INTEGRAL/SPI, X/γ-ray spectrometer (20 keV-8 MeV) is an instrument for which recovering source intensity variations is not straightforward and can constitute a difficulty for data analysis. In most cases, determining the source intensity changes between exposures is largely based on a priori information.
Aims: We propose techniqu…