Search Publications
Posteruptive phenomena in coronal mass ejections and substorms: Indicators of a universal process?
Webb, D. F.; Wiltberger, M.; Schwadron, N. A. +8 more
We examine phenomena associated with eruptions in the two different regimes of the solar corona and the terrestrial magnetosphere. We find striking similarities between the speeds of shrinking magnetic field lines in the corona and dipolarization fronts traversing the magnetosphere. We also examine the similarities between supra-arcade downflows o…
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 …
The redshifted footpoints of coronal loops
Parenti, S.; Dwivedi, B. N.; Curdt, W. +1 more
The physics of coronal loops holds the key to understanding coronal heating and the flow of mass and energy in the region. However, the energy source, structure maintenance and mass balance in coronal loops are not yet fully understood. Observations of blue- and redshifted emissions have repeatedly been used in the construction of loop models. But…
Multispacecraft and ground-based observations of substorm timing and activations: Two case studies
Escoubet, C. P.; Dandouras, I.; Zhang, H. +23 more
Two case studies are performed to investigate substorm timing and activations based on Double Star TC1, Cluster, Polar, IMAGE, LANL geostationary satellites and ground-based geomagnetic field measurements. In both events, an earthward flow associated with plasma sheet thinning is measured by Cluster 8-10 min ahead of the auroral breakup. A couple …
Observations of the Prompt Gamma-Ray Emission of GRB 070125
Yamaoka, Kazutaka; Hong, Soojing; Kodaka, Natsuki +17 more
The long, bright gamma-ray burst GRB 070125 was localized by the Interplanetary Network. We present light curves of the prompt gamma-ray emission as observed by Konus-Wind, RHESSI, Suzaku WAM, and Swift BAT. We detail the results of joint spectral fits with Konus and RHESSI data. The burst shows moderate hard-to-soft evolution in its multipeaked e…
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 …
Detection of Dense Molecular Gas in Interarm Spurs in M51
Koda, Jin; Scoville, Nicholas Z.; Sheth, Kartik +3 more
Spiral arm spurs are prominent features that have been observed in extinction and 8 µm emission in nearby galaxies. In order to understand their molecular gas properties, we used the Owens Valley Radio Observatory (OVRO) to map the CO(1-0) emission in three spurs emanating from the inner northwestern spiral arm of M51. We report CO detection…