Search Publications
Multi-spacecraft observations of polar coronal plumes
Feng, L.; Wilhelm, K.; Curdt, W. +1 more
Aims:Coronal plumes, along with their structure and rôle in the acceleration of the fast solar wind, are of considerable importance in understanding the physics of the solar atmosphere, in particular, when contrasted with the adjacent plasma, the so-called interplume regions.
Methods: Observations of coronal plumes in a coronal hole were obtai…
The XMM-Newton survey of the ELAIS-S1 field. II. Optical identifications and multiwavelength catalogue of X-ray sources
Berta, S.; Pozzi, F.; Fiore, F. +13 more
We present the optical identifications and a multi-band catalogue of a sample of 478 X-ray sources detected in the XMM-Newton and Chandra surveys of the central 0.6 deg2 of the ELAIS-S1 field. The most likely optical/infrared counterpart of each X-ray source was identified using the chance coincidence probability in the R and IRAC 3.6 &…
A C-level flare observed in an arch filament system: reconnection between pre-existing and emerging field lines?
Romano, P.; Spadaro, D.; Contarino, L. +3 more
Context: Observations show that solar flares are often caused by the emergence of new magnetic flux from subphotospheric layers and by the interaction of the rising field lines with the ambient magnetic field. In this framework, recent theoretical models of magnetic flux emergence have investigated the effectiveness of magnetic reconnection as a f…
HE 0515-4414: an unusual sub-damped Ly α system revisited
Reimers, D.; Baade, R.; Quast, R.
Aims:We examine the ionization, abundances, and differential dust depletion of metals, the kinematic structure, and the physical conditions in the molecular hydrogen-bearing sub-damped Ly α system toward HE 0515-4414.
Methods: We used the STIS and VLT UVES spectrographs to obtain high-resolution recordings of the damped Ly α profile and numero…
INTEGRAL long-term monitoring of the supergiant fast X-ray transient XTE J1739-302
Pottschmidt, K.; Reig, P.; Torrejón, J. M. +6 more
Context: In the past few years, a new class of high mass X-ray binaries (HMXRB) has been claimed to exist, the supergiant fast X-ray transients (SFXT). These are X-ray binary systems with a compact companion orbiting a supergiant star which show very short and bright outbursts in a series of activity periods overimposed on longer quiescent periods…
XMM-Newton slew survey discovery of the nova XMMSL1 J070542.7-381442 (V598 Puppis)
Read, A. M.; Esquej, P.; Challis, P. +6 more
Aims: In an attempt to catch new X-ray transients while they are still bright, the data taken by XMM-Newton as it slews between targets are being processed and cross-correlated with other X-ray observations as soon as the slew data appear in the XMM-Newton archive.
Methods: A bright source, XMMSL1 J070542.7-381442, was detected on 9 Oct. 2007 …
Forced oscillations of coronal loops driven by EIT waves
Ballai, I.; Douglas, M.; Marcu, A.
Aims: We study the generation of transversal oscillations in coronal loops represented as a straight thin flux tube under the effect of an external driver modelling the global coronal EIT wave. We investigate how the generated oscillations depend on the nature of the driver, and the type of interaction between the two systems.
Methods: We cons…
Nonthermal and thermal diagnostics of a solar flare observed with RESIK and RHESSI
Mason, H. E.; Del Zanna, G.; Sylwester, B. +4 more
Aims: We aim to prove and diagnose the occurrence of nonthermal electron distributions in solar flare plasma using X-ray spectral observations.
Methods: An M4.9 flare on 2003 January 7/8 was observed with the RESIK instrument in the 3-6 Å wavelength range (2-4 keV) and with RHESSI at energies above 6 keV. The temporal behavior of RESIK flare s…
Surface properties of Rosetta's targets (21) Lutetia and (2867) Steins from ESO observations
Barucci, M. A.; Fornasier, S.; Lowry, S. +3 more
Aims: The aim of this work is to constrain the size, composition and surface properties of asteroids (2867) Steins and (21) Lutetia, targets of the Rosetta mission. Rosetta is en route to rendezvous with comet 67P/Churyumov-Gerasimenko.
Methods: Thermal-Infrared N-band observations for Lutetia and Steins were obtained using, respectively, TIMM…
Radiative and magnetic properties of solar active regions. I. Global magnetic field and EUV line intensities
Fludra, A.; Ireland, J.
Context: The relationships between the photospheric magnetic flux and either the X-ray or extreme ultraviolet emission from the solar atmosphere have been studied by several authors. Power-law relations have been found between the total magnetic flux and X-ray flux or intensities of the chromospheric, transition region, and coronal emission lines …