Search Publications
Mineralogy of the Phoenix landing site from OMEGA observations and how that relates to in situ Phoenix measurements
Bibring, J. -P.; Arvidson, R. E.; Gondet, B. +4 more
We present an analysis comparing observations acquired by the Mars Express Observatoire pour la Minéralogie l'Eau, les Glaces et l'Activité (OMEGA) and Phoenix lander measurements. Analysis of OMEGA data provides evidence for hydrous and ferric phases at the Phoenix landing site and the surrounding regions. The 3 µm hydration band deepens wi…
What can be learned from the absence of auroral X-ray emission from Saturn?
Cravens, Thomas E.; Hui, Yawei; Schultz, David R. +1 more
To understand the origin and magnitude of the present upper limit observations of Saturn's auroral X-ray emission, we use simple models based on the mechanism that leads to analogous emission at Jupiter, charge transfer between ion precipitation and atmospheric gas. Several putative sources and characteristics of the precipitation are considered, …
Spectral anisotropy of solar wind turbulence in the inertial range and dissipation range
Podesta, J. J.
Wavelet analysis is a tool that can simultaneously analyze spacecraft data in both time and frequency. This enables the magnetic energy spectrum (trace spectrum) to be measured for different angles between the local mean magnetic field B0 and the direction of the mean flow within a single data set. Examples obtained around solar minimum…
Study of the Large-Scale Temperature Structure of the Perseus Cluster with Suzaku
Fukazawa, Yasushi; Nakazawa, Kazuhiro; Nishino, Sho +2 more
We report on a study of the large-scale temperature structure of the Perseus cluster with Suzaku, using the observational data of four pointings of 30' offset regions, together with the data from the central region. Thanks to the Hard X-ray Detector (HXD-PIN: 10 - 60 keV), Suzaku can determine the temperature of hot galaxy clusters. We performed t…
CaII K Spectral Study of an Emerging Flux Region using the Domeless Solar Telescope in Hida Observatory
Matsumoto, Takuma; Shibata, Kazunari; Ichimoto, Kiyoshi +5 more
A cooperative observation with Hida Observatory and the Hinode satellite was performed on an emerging flux region. Successive CaII K spectro-heliograms of the emerging flux region were taken by the Domeless Solar Telescope of Hida Observatory. Hinode observed the emerging flux region with CaII H and FeI Stokes IQUV filtergrams. In this study, deta…
Analysis of disturbances in the Planetary Fourier Spectrometer through numerical modeling
Saggin, Bortolino; Comolli, Lorenzo
Fourier transform spectrometers are instruments with high sensitivity to many kinds of disturbances. This study started from the analysis of the disturbances related to mechanical vibrations on the PFS FTIR spectrometer to show how the measured spectra can differ from the actual ones. The complete study, more in general, accounts for the character…
Spectrum of the electron density fluctuations: preliminary results from Ulysses observations
Alexandrova, O.; Issautier, K.; Mangeney, A.
Ulysses in-situ measurements have given a new picture on the large-scale properties of the fast solar wind as well as on the microscopic scales. From the large sample of data obtained during Ulysses fast latitudinal scans in 1994 and 2007 occuring both near solar minima, we will present the spectrum of the electron density fluctuations. The prelim…
Sign-Singularity of the Reduced Magnetic Helicity in the Solar Wind Plasma
Perri, S.; André, M.; Khotyaintsev, Y. +4 more
We investigate the scaling laws of a signed measure derived from the reduced magnetic helicity which has been determined from Cluster data in the solar wind. This quantifies the handedness of the magnetic field; namely, it can be related to the polarization of the magnetic field fluctuations (right or left hand). The measure results to be sign-sin…
New outburst of A 0535+26 observed with INTEGRAL and RXTE
Klochkov, D.; Santangelo, A.; Wilms, J. +14 more
A new outburst of the Be/X-ray binary system A0535+26 took place in August 2009. It is the fourth in a series of normal outbursts that have occurred around the periastron passage of the source, but is unusual by starting at an earlier orbital phase and by presenting a peculiar double-peaked light curve. TOO observations have been performed with IN…
The AKARI FU-HYU galaxy evolution program: first results from the GOODS-N field
Lee, H. M.; Negrello, M.; Serjeant, S. +7 more
The AKARI FU-HYU mission program carried out mid-infrared imaging of several well studied Spitzer fields preferentially selecting fields already rich in multi-wavelength data from radio to X-ray wavelengths filling in the wavelength desert between the Spitzer IRAC and MIPS bands. We present the initial results for the FU-HYU survey in the GOODS-N …