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Dynamics of the Saturnian inner magnetosphere: First inferences from the Cassini magnetometers about small-scale plasma transport in the magnetosphere
André, N.; Russell, C. T.; Dougherty, M. K. +2 more
The Cassini magnetometers reveal a very dynamic plasmadisc within the inner Saturnian magnetosphere during the first three orbits of the Cassini orbital tour. This corotation-dominated region is known to contain various neutral and plasma populations and Voyager spacecraft observations suggest important radial transport processes redistribute the …
Magnetic Properties at Footpoints of Hot and Cool Loops
Tsuneta, Saku; Katsukawa, Yukio
Observations of the solar corona with Yohkoh, the Solar and Heliospheric Observatory, and the Transition Region and Coronal Explorer (TRACE) have revealed that individual coronal loops of active regions have their own temperatures from 1 to 5 MK. The hot (2-5 MK) Soft X-Ray Telescope (SXT) loops appear to require more heating energy than the cool …
X-ray emission from NGC 1808: more than a complex starburst
Mas-Hesse, J. M.; Guainazzi, M.; Santos-Lleó, M. +5 more
Earlier observations of NGC 1808 in various wavebands (X-ray, optical, near-infrared, radio) provided evidence for the existence of either a starburst or a Seyfert 2 nucleus. We here present the results of multiwavelength XMM-Newton and Chandra observations, which directly prove the co-existence of thermal diffuse plasma and non-nuclear unresolved…
The extended hard X-ray emission from the Vela Plerion
Cusumano, G.; Bocchino, F.; Mineo, T. +2 more
We present the results of a broad band (3-200 keV) spectral analysis of BeppoSAX and XMM-Newton observations of the Vela plerion. The hard X-ray (>15 keV) emission is found to be extended over a region of 12'-15' radius, corresponding to a size of about 1.0-1.3 pc for a source distance of 290 pc. A single power law does not give an acceptable f…
The star cluster population of NGC 5253
Sauvage, M.; Cresci, G.; Vanzi, L.
We present a detailed analysis of the star cluster population in the starburst galaxy NGC 5253. Our work is based on HST optical and VLT Ks images. We detect more than 300 clusters, and for all of them we derive the photometry in the V, I and Ks bands and built a color-color V-I/V-Ks diagram. After correction for star contamination, we matched 115…
High-Cadence Radio Observations of an EIT Wave
Thompson, B. J.; White, S. M.
Sensitive radio observations of the 1997 September 24 EIT wave show its velocity to be 830 km s-1. The wave first appears a short distance from the flare site, and its trajectory projects back to the flare site at the peak of the impulsive phase. The radio spectrum appears to be consistent with optically thin coronal emission rather tha…
A solar spectrum for PFS data analysis
Formisano, Vittorio; Fiorenza, Carlo
A measured calibrated solar radiance in the range 1.2- 5µm, with the spectral sampling of 1cm-1 does not exist. When studying the measured Planetary Fourier Spectrometer (PFS) spectra of the Earth's or Mars's atmosphere we discover that the most used solar spectrum contains several important errors. Here we present a "calibrated" …
Theoretical Interpretation of the Luminosity and Spectral Properties of GRB 031203
Ruffini, Remo; Bernardini, Maria Grazia; Fraschetti, Federico +3 more
The X-ray and gamma-ray observations of the source GRB 031203 by INTEGRAL are interpreted within our theoretical model. In addition to a complete spacetime parameterization of the GRB, we specifically assume that the afterglow emission originates from a thermal spectrum in the comoving frame of the expanding baryonic matter shell. By determining t…
X-Ray Timing, Spectroscopy, and Photometry of the Anomalous X-Ray Pulsar Candidate CXOU J010043.1-721134
Ransom, S. M.; Gaensler, B. M.; Kaspi, V. M. +2 more
We present new X-ray timing and spectral results on the 8.0 s X-ray pulsar CXOU J010043.1-721134 from a series of observations using the Chandra X-Ray Observatory. We found a spin period in 2004 January of 8.020392+/-0.000009 s. A comparison of this to the 2001 Chandra observations implies a period derivative P˙=(1.88+/-0.08)×10-11 s s<…
On the Combination of Differential Emission Measure Analysis and Rotational Tomography for Three-dimensional Solar EUV Imaging
Frazin, R. A.; Weber, M. A.; Kamalabadi, F.
Conventional differential emission measure (DEM) analysis allows one to determine the amount of plasma as a function of temperature along a given line of sight. A completely different technique called solar rotational tomography (SRT) exploits the view angles provided by solar rotation to determine the spatial distribution of emissivity in three d…