Search Publications
A study of the changes of the near-Earth plasma sheet and lobe driven by multiple substorms: Comparison with a full particle simulation of reconnection
Sauvaud, J. -A.; Balogh, A.; Kistler, L. M. +9 more
Comparisons of multispacecraft observations and full-particle simulations are used to understand magnetotail changes during substorms and the related cross-tail current disruptions/reductions. We first show that the electric field accompanying current disruptions can be measured in the tail lobe from the drift velocity of oxygen beams. A stormy pe…
Cold Ion Outflow as a Source of Plasma for the Magnetosphere
Nilsson, H.; André, M.; Haaland, S. E. +9 more
The shallow-decay phase in both the optical and X-ray afterglows of Swift GRB 090529A: energy injection into a wind-type medium?
Fynbo, J. P. U.; Kann, D. A.; Leloudas, G. +22 more
The energy injection model is the usual choice for interpreting the shallow-decay phase in Swift gamma-ray burst (GRB) X-ray afterglows. However, very few GRBs have simultaneous signatures of energy injection in their optical and X-ray afterglows. Here, we report on the optical observations of GRB 090529A from 2000 s to ∼106 s after the…
Prominent Photospheric Downflows on Magnetic Neutral Line in a Delta-Type Sunspot
Zhang, Y.; Takizawa, K.; Kitai, R.
It is known that δ-type sunspot groups have a high flare productivity and produce strong flares. In particular, βγδ type sunspots are the most active type of all. A βγδ active region NOAA 9957 with frequent flux cancellations but without any marked flare activity during its decay phase was studied in this work. Using SOHO/MDI Dopplergrams and magn…
Dynamics of CMEs in the LASCO Field of View - Statistical Analysis
Michalek, G.
A large set of CMEs (2207) has been selected to study their dynamics in the SOHO/LASCO field of view (LFOV). These selected events have at least seven height-time measurements and their acceleration can be determined separately in the C2 and C3 LFOVs. It was demonstrated that the balance between the aerodynamic drag and driving Lorentz forces may …
Ejecta detection in the middle-aged Galactic supernova remnant G296.1-0.5 observed with Suzaku
Sezer, A.; Gök, F.
In this paper, we report the detection of ejecta in the middle-aged Galactic supernova remnant G296.1-0.5 with the X-ray Imaging Spectrometer onboard the Suzaku satellite. The spectra of three lobes, north, south-east and south-west and interlobe regions, consist of soft (0.3-2.0 keV) emission originated from non-equilibrium ionization plasma. In …
Magnetospheric line radiation event observed simultaneously on board Cluster 1, Cluster 2 and DEMETER spacecraft
Pickett, J. S.; Santolík, O.; Parrot, M. +1 more
We present a case study of a magnetospheric line radiation (MLR) event observed simultaneously by Cluster 1 and Cluster 2 during a perigee passage at a radial distance of about 4 RE and, at the same time, by the low-orbiting DEMETER satellite. This unique constellation enables us to analyze spatiotemporal variability of the phenomenon. …
On the X-Ray Emission Mechanisms of the Persistent Source and Very Low Fluence Bursts of SGR J0501+4516
Kouveliotou, Chryssa; Göǧüş, Ersin; Lin, Lin +1 more
We present here a detailed spectral study of the X-ray emission of the persistent source and the low-fluence bursts of SGR J0501+4516 observed during a deep XMM-Newton observation near the peak of its 2008 outburst. For the persistent emission, we employ a physically motivated continuum emission model and spectroscopically determine important sour…
Comparisons of Cassini flybys of the Titan magnetospheric interaction with an MHD model: Evidence for organized behavior at high altitudes
Luhmann, J. G.; Russell, C. T.; Dougherty, M. K. +8 more
Recent papers suggest the significant variability of conditions in Saturn's magnetosphere at the orbit of Titan. Because of this variability, it was expected that models would generally have a difficult time regularly comparing to data from the Titan flybys. However, we find that in contrast to this expectation, it appears that there is underlying…
The XMM Cluster Survey: predicted overlap with the Planck Cluster Catalogue
Hilton, Matt; Stott, John P.; Stanford, S. Adam +14 more
We present a list of 15 clusters of galaxies, serendipitously detected by the XMM Cluster Survey (XCS), that have a high probability of detection by the Planck satellite. Three of them already appear in the Planck Early Sunyaev-Zel'dovich (ESZ) catalogue. The estimation of the Planck detection probability assumes the flat Lambda cold dark matter (…