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The dynamics of jovian white ovals from formation to merger
Marcus, Philip S.; Youssef, Ashraf
In early 1998 two of the three, long-lived anticyclonic, jovian white ovals merged. In 2000 the two remaining white ovals merged into one. Here we examine that behavior, as well as the dynamics of three earlier epochs: the Formation Epoch (1939-1941), during which a nearly axisymmetric band broke apart to form the vortices; the Kármán Vortex Stree…
XMM-Newton observations of four high-z quasars
Brinkmann, W.; Ferrero, E.
We present the results of XMM-Newton observations of four high-z quasars, two radio-loud and two radio-quiet. One of the radio-loud objects, PKS 2126-158, clearly shows absorption in excess of the galactic value as claimed before from ASCA and ROSAT observations. For PKS 2149-306 the evidence for excess absorption is only marginal in contrast to p…
On the formation of star clusters in the merger NGC 6240
Gallagher, J. S.; de Grijs, R.; Pasquali, A.
We identified star clusters in archived Hubble Space Telescope/Wide Field Planetary Camera 2 (HST/WFPC2) images of the merger and ultraluminous infrared galaxy NGC 6240, with the aim of investigating whether star cluster properties (luminosity, age and mass) in such an extreme environment differ from those of clusters in less luminous starburst ga…
A numerical study on the acceleration and transit time of coronal mass ejections in the interplanetary medium
Gopalswamy, Nat; Lara, Alejandro; GonzáLez-Esparza, J. AméRico +2 more
Recently, an empirical model of the acceleration/deceleration of coronal mass ejections (CMEs) as they propagate through the solar wind was developed using near-Sun (coronagraphic) and near-Earth (in situ) observations [, 2000, 2001a]. This model states and quantifies the fact that slow CMEs are accelerated and fast CMEs are decelerated toward the…
Multi-point electric field measurements of Short Large-Amplitude Magnetic Structures (SLAMS) at the Earth's quasi-parallel bow shock
Eriksson, Anders I.; Vaivads, Andris; André, Mats +4 more
We present the first direct measurements of the electric field and plasma density with high resolution in Short Large-Amplitude Magnetic Structures (SLAMS) at a quasi-parallel shock crossing. Cluster observations at the Earth's bow shock confirm the fast-mode structure of SLAMS. Using the four Cluster spacecraft, we determine the velocity of the S…
Temporal Evolution of a Streamer Complex: Coronal and in Situ Plasma Parameters
Parenti, S.; Romoli, M.; Riley, P. +5 more
We report on observations acquired by the Ultraviolet Coronagraph Spectrometer (UVCS) aboard the Solar and Heliospheric Observatory (SOHO), from 2000 June 10 to June 17 at the time of a SOHO-Sun-Ulysses quadrature. UVCS took data at 1.6 and 1.9 Rsolar with a slit normal to the solar radius and centered along the radial to Ulysses. A str…
XMM-Newton observation of SN 1993J in M 81
Aschenbach, B.; Zimmermann, H. -U.
In April 2001 SN 1993J was observed with both the PN and MOS cameras of the XMM-Newton observatory, resulting in about 7x 104 s of acceptable observation time. Fit results with both the PN and MOS2 camera spectra studying different spectral models are presented. The spectra are best fitted in the energy range between 0.3 and ~ 10 keV by…
Radiation environment along the INTEGRAL orbit measured with the IREM monitor
Favre, P.; Hajdas, W.; Bühler, P. +3 more
The INTEGRAL Radiation Environment Monitor (IREM) is a payload supporting instrument on board the INTEGRAL satellite. The monitor continually measures electron and proton fluxes along the orbit and provides this information to the spacecraft on board data handler. The mission alert system broadcasts it to the payload instruments enabling them to r…
Technetium and the third dredge up in AGB stars. I. Field stars
Lebzelter, T.; Hron, J.
We searched for Tc in a sample of long period variables selected by stellar luminosity derived from Hipparcos parallaxes. Tc, as an unstable s-process element, is a good indicator for the evolutionary status of stars on the asymptotic giant branch (AGB). In this paper we study the occurrence of Tc as a function of luminosity to provide constraints…
SPI-specific analysis method and software overview
Knödlseder, J.; von Kienlin, A.; Schanne, S. +13 more
The SPI spectrometer on INTEGRAL features a camera system with 19 Ge detector modules, imaging photons through a tungsten coded mask. Background is reduced by an anticoincidence detector system surrounding these. The specifics of this instrument lead to data correction and analysis methods which are described here. Raw data for science analysis ar…