Search Publications
Missions
Journals
Publication Years
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…
New deep XMM-Newton observations to the west of the σ Orionis cluster
Caballero, J. A.; López-Santiago, J.
Aims: The objective of this study is to determine the general X-ray properties of the young stars in the external regions of the σ Orionis cluster (τ ~ 3 Ma, d ~ 385 pc) and determine constraints on the X-ray emission of brown dwarfs.
Methods: We carried out a careful analysis of public data obtained from an unexplored region to the west of th…
Doppler imaging an X-ray flare on the ultrafast rotator BO Mic. A contemporaneous multiwavelength study using XMM-Newton and VLT
Schmitt, J. H. M. M.; Wolter, U.; Robrade, J. +1 more
We present an analysis of contemporaneous photospheric, chromospheric and coronal structures on the
highly active K-dwarf star BO Mic (Speedy Mic). We concentrate on a moderate flare that we localize in the stellar atmosphere and study its energetics, size and thermal behavior. The analysis is based on strictly simultaneous X-r…Swift captures the spectrally evolving prompt emission of GRB070616
Page, M. J.; Norris, J. P.; O'Brien, P. T. +14 more
The origins of gamma-ray burst (GRB) prompt emission are currently not well understood and in this context long, well-observed events are particularly important to study. We present the case of GRB070616, analysing the exceptionally long-duration multipeaked prompt emission, and later afterglow, captured by all the instruments on-board Swift and b…