Search Publications
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…
The mass ratio of Charon to Pluto from Hubble Space Telescope astrometry with the fine guidance sensors
Olkin, C. B.; Franz, O. G.; Wasserman, L. H.
The mass ratio of Charon to Pluto is a basic parameter describing the binary system and is necessary for determining the individual masses and densities of these two bodies. Previous measurements of the mass ratio have been made, but the solutions differ significantly (Null et al., 1993; Young et al., 1994; Null and Owen, 1996; Foust et al., 1997;…
Detection of Pulsed X-Ray Emission from XMM-Newton Observations of PSR J0538+2817
Cropper, M.; McGowan, K. E.; Kennea, J. A. +5 more
We report on the XMM-Newton observations of the 143 ms pulsar PSR J0538+2817. We present evidence for the first detections of pulsed X-rays from the source at a frequency that is consistent with the predicted radio frequency. The pulse profile is broad and asymmetric, with a pulse fraction of 18%+/-3%. We find that the spectrum of the source is we…
Active Star Formation in the N11B Nebula in the Large Magellanic Cloud: A Sequential Star Formation Scenario Confirmed
Barbá, Rodolfo H.; Rubio, Mónica; Roth, Miguel R. +1 more
The second largest H II region in the Large Magellanic Cloud, N11B has been surveyed in the near-IR. We present JHKs images of the N11B nebula. These images are combined with CO (1-->0) emission-line data and with archival New Technology Telescope and Hubble Space Telescope WFPC2 optical images to address the star formation activity …