Search Publications
Could the GRB-supernovae GRB031203 and XRF060218 be cosmic twins?
Feng, Lu; Fox, Derek B.
The gamma-ray burst (GRB)/X-ray flash (XRF) events GRB031203, discovered by INTEGRAL, and XRF060218, discovered by Swift, represent two of the only five GRB-supernovae (GRB-SNe) with optical spectroscopic confirmation of their SN components. Yet, their observed high-energy properties offer a sharp contrast: while GRB031203 was detected as a short …
On the origin of the tailward velocity of O+ ions over the magnetic poles of Mars
Pérez-de-Tejada, H.; Reyes-Ruiz, M.; Aceves, H.
We numerically simulate the dynamics of a population of O+ ions of ionospheric origin picked-up by the solar wind in the dayside ionosheath of Mars. Their average velocity as they reach the magnetic polar regions of the planet is compared with in situ measurements of the Mars Express spacecraft. We find that the velocity of O+ ions measured over t…
On the thermal history of Saturn's satellites Titan and Enceladus
Dorofeeva, V. A.; Ruskol, E. L.
The thermal histories of two geologically active satellites of Saturn—Titan and Enceladus—are discussed. During the Cassini mission, it was found that there are both nitrogen-containing compounds—NH3 and N2-and CO2 and CH4 in the water plumes of Enceladus; at that, ammonia is the prevailing form. This ma…
Cluster Observations of Energy Conversion Regions in the Plasma Sheet
André, M.; Hamrin, M.; Marghitu, O. +5 more
Cluster allows for the first time a systematic examination of energy conversion, by the evaluation of the power density, E · J, with E the electric field and J the current density. Following a careful inspection of the Cluster plasma sheet data from the summer and fall of 2001, we selected 43 energy conversion regions (ECRs), out of which 26 conce…
Multisatellite low-altitude observations of a magnetopause merging burst
Wing, Simon; Liou, Kan; Newell, Patrick T. +3 more
A fortuitous multisatellite observation of a dayside merging event driven by a sharp southward interplanetary magnetic field (IMF) turning illuminates several ionospheric particle and auroral reconnection signatures. Shortly after the southward IMF turning, as propagated from ACE, DMSP F13 observed a region equatorward of the cusp emptied of magne…
Cluster-PEACE In-flight Calibration Status
Fazakerley, A. N.; Åsnes, A.; West, M. +5 more
We briefly summarise key aspects of our on-going in-flight calibration work for the Cluster Plasma Electron And Current Experiment (PEACE) instruments, and demonstrate the quality of moments which may be achieved, by comparisons with measurements from other Cluster instruments. As improved calibrations are generated, data in scientific units which…
X-ray Shadowing Experiments Toward Infrared Dark Clouds
Snowden, S. L.; Anderson, L. D.; Bania, T. M.
We searched for X-ray shadowing toward two infrared dark clouds (IRDCs) using the MOS detectors on XMM-Newton to learn about the Galactic distribution of X-ray emitting plasma. IRDCs make ideal X-ray shadowing targets of 3\over 4 keV photons due to their high column densities, relatively large angular sizes, and known kinematic distances. Here we …
The influence of Titan on Saturn kilometric radiation
Cecconi, B.; Ye, S. -Y.; Menietti, J. D. +1 more
Previous studies have shown that the occurrence probability of Saturn Kilometric Radiation (SKR) appears to be influenced by the local time of Titan. Using a more extensive set of data than the original study, we confirm the correlation of higher occurrence probability of SKR when Titan is located near local midnight. In addition, the direction fi…
Fine-scale density wave structure of Saturn's rings: A hydrodynamic theory
Gedalin, M.; Griv, E.
Aims: We examine the linear stability of the Saturnian ring disk of mutually gravitating and physically colliding particles with special emphasis on its fine-scale ~100 m density wave structure, that is, almost regularly spaced, aligned cylindric density enhancements and optically-thin zones with the width and the spacing between them of roug…
Cluster Hot Flow Anomaly Observations During Solar Cycle Minimum
Dandouras, I.; Facskó, G.; Erdős, G. +1 more
Hot flow anomalies (HFAs) are studied using observations of the FGM magnetometer and the CIS plasma detector aboard the four Cluster spacecraft. Previously we studied several specific features of tangential discontinuities on the basis of Cluster measurements in February-April 2003 and discovered a new condition for forming HFAs that is the solar …