Search Publications
The atmosphere of Venus: winds and clouds observed by VIRTIS/VENUS EXPRESS
Hueso, R.; Sánchez-Lavega, A.; Pérez-Hoyos, S. +1 more
After decades without a dedicated space mission, Venus, sometimes referred as Earth's twin planet, is again the subject of intense exploration. Venus Express (VEX), a mission of the European Space Agency, was launched in November 2005 and arrived to the planet in April 2006 where it is now in orbit. Among its scientific payload, the Visible and In…
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS: Interhemispheric Comparison of Dipole Tilt Angle Effects on Latitude of Mid-Altitude Cusp
Liu, Zhen-Xing; Shi, Jian-Kui; Zhang, Tie-Long +1 more
A statistical study of interhemispheric comparison of dipole tilt angle effect on the latitude of the mid-altitude cusp is preformed by a data set of the Cluster cusp crossings over a 5-year period. The result shows that the dipole tilt angle has a clear control of the cusp latitudinal location. When the dipole tilts sunwards, the cusp is shifted …
Doing physics in star-forming regions with XMM-Newton
Montmerle, T.
Star-forming regions have been observed in X-rays since the first generation of satellites in the late 70s. They are very rich in magnetically-controlled X-ray phenomena: stellar flares and star-disk interactions in hundreds of T Tauri stars, confined winds in massive stars, etc. More recently, in a few low-mass stars, X-ray evidence has been foun…
``Resolving" neutron stars physics and geometry
Caraveo, P. A.
The unprecedented harvest of X-ray photons detected from dozens of isolated neutron stars has made it possible to glimpse at their emission mechanisms as well as at their emission geometry. Rotating hot spot(s), superimposed to the global thermal emission from the neutron star surface, are seen from several objects, allowing to probe the stars' ex…
The Huygens Surface Science Package sound speed measurements and the methane content of Titan's atmosphere
Zarnecki, John C.; Lorenz, Ralph D.; Hagermann, A. +6 more
X-Ray observations of the Galactic Centre with Suzaku
Koyama, K.; Nobukawa, M.; Mori, H. +2 more
We report on the diffuse X-ray emission from the Galactic Centre (GCDX) observed with the X-ray Imaging Spectrometer (XIS) on board the Suzaku satellite. The highly accurate energy calibration and extremely low background of the XIS provide many new facts on the GCDX. These are (1) the origin of the lines at 6.7 and 7.0 keV is collisional excitati…
Compiled catalog of the proper motions and infrared photometry of stars at the north Galactic pole
Rybka, S. P.; Yatsenko, A. I.
We describe the procedure we used to compile a catalog of the proper motions of 23 633 stars in the sky area covering about 700 square degrees at the north Galactic pole. The compiled catalog combines the data from the UCAC2, Tycho-2, and FONAC catalogs for stars down to V ∼ 14m in this sky area. In addition to proper motions, the catal…
Extracting oscillation frequencies from sparse spectra: Fourier analysis
Jerzykiewicz, M.
I begin by explaining the properties of spectral windows of time-series data. Emphasis is on data obtained at a single geographic longitude, but ground-based multi-longitude cam- paigns and space missions such as MOST and Hipparcos are not entirely neglected. In the second section, I consider the Fourier transform of time-series data and the proce…
Possibility to detect the cluster emission up to R200 with XMM-Newton data
Sauvageot, J. -L.; Solovyeva, L.; Anokhin, S.
We present the results of analysis XMM-Newton data of galaxy cluster CL0016+16, which enables us to trace X-ray emission and temperature profile up to the virial radius. We obtained similar results using three different backgrounds. We checked the possibility of detection of cluster emission up to the virial radius with XMM-Newton data with hydrod…
Radial diffusion coefficients of 1-30 MeV protons in the outer heliosphere
Kecskeméty, K.; Logachev, Yu. I.; Zeldovich, M. A.
Radial variations of quiet-time fluxes of ~1-30 MeV protons are examined at distances of 2-85 AU using Voyager 1-2 (LECP, CRS) and Ulysses (LET) data. Attention is focused on the solar cycle minima of 1985-87 and 1995-97. Gradient values calculated from particle fluxes show an increase between 30 and 70 AU during the recovery phases of galactic co…