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X-Ray Spectroscopy of SN 1006 with Suzaku
Katsuda, Satoru; Yamaguchi, Hiroya; Koyama, Katsuji +7 more
We report on observations of SN 1006 with Suzaku. We firmly detected K-shell emission from Fe, for the first time, and found that the Fe ionization state is quite low. The broad-band spectrum extracted from southeast of the remnant was well-fitted with a model consisting of three optically thin thermal non-equilibrium ionization plasmas and a powe…
Magnetosheath Plasma Turbulence and Its Spatiotemporal Evolution as Observed by the Cluster Spacecraft
André, M.; Vaivads, A.; Vörös, Z. +2 more
We study the plasma turbulence, at scales larger than the ion inertial length scale, downstream of a quasiparallel bow shock using Cluster multispacecraft measurements. We show that turbulence is intermittent and well described by the extended structure function model, which takes into account the spatial inhomogeneity of the cascade rate. For the…
Revised Orbits of Saturn's Small Inner Satellites
Porco, C. C.; Cooper, N. J.; Murray, C. D. +4 more
We have updated the orbits of the small inner Saturnian satellites using additional Cassini imaging observations through 2007 March. Statistically significant changes from previously published values appear in the eccentricities and inclinations of Pan and Daphnis, but only small changes have been found in the estimated orbits of the other satelli…
SDSSJ124155.33+114003.7 - a missing link between compact elliptical and ultracompact dwarf galaxies
Mamon, Gary A.; Chilingarian, Igor V.
We report the discovery of a compact object (Re = 32 pc, MB = -12.34 mag) at a projected distance of 9 kpc from Messier 59, a giant elliptical in the Virgo cluster. Using HST imaging and SDSS spectroscopy, both available in the Virtual Observatory, we find that this object has a blue core containing one-quarter of the light, …
Superdiffusive transport of electrons accelerated at corotating interaction regions
Zimbardo, Gaetano; Perri, Silvia
Energetic particles in the solar wind are accelerated at interplanetary shock waves associated with corotating interaction regions (CIRs) and propagate in the presence of a spectrum of magnetic turbulence, which causes pitch angle scattering upstream of the shock. Besides normal diffusive transport, we study the possibility of superdiffusive trans…
Calibrated griz Magnitudes of Tycho Stars: All-Sky Photometric Calibration Using Bright Stars
Ofek, Eran O.
Photometric calibration to ∼5% level is frequently needed at arbitrary celestial location. However, existing all-sky astronomical catalogs do not reach this accuracy, and time consuming photometric calibration procedures are required. I fitted the Hipparcos BT and VT magnitudes, along with the 2MASS J, H, and K magnitudes of …
An active region jet observed with Hinode
Young, P. R.; Mason, H. E.; Isobe, H. +4 more
Aims:We study the physical properties of an active region (AR) jet in order to probe the mechanisms responsible for it.
Methods: We report 2007 January 15/16 observations of a recurring jet situated on the west side of NOAA AR 10938. Multi-wavelength data from all three instruments onboard Hinode were analysed. This paper focuses on one instan…
Correction of the ionospheric distortion on the MARSIS surface sounding echoes
Safaeinili, A.; Mouginot, J.; Kofman, W. +1 more
Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) on the Mars Express (MEX) spacecraft has made numerous measurements of the Martian surface and subsurface. However, all of these measurements are distorted by the ionosphere and must be compensated before any analysis. We have developed a technique to compensate for the ionospher…
3D Magnetic Field Configuration of the 2006 December 13 Flare Extrapolated with the Optimization Method
Ding, M. D.; Li, H.; Guo, Y. +1 more
The photospheric vector magnetic field of the active region NOAA 10930 was obtained with the Solar Optical Telescope (SOT) on board the Hinode satellite with a very high spatial resolution (about 0.3''). Observations of the two-ribbon flare on 2006 December 13 in this active region provide us a good sample to study the magnetic field configuration…
Cluster multispacecraft determination of AKR angular beaming
Pickett, J. S.; Mutel, R. L.; Christopher, I. W.
Simultaneous observations of AKR emission using the four-spacecraft Cluster array were used to make the first direct measurements of the angular beaming patterns of individual bursts. By comparing the spacecraft locations and AKR burst locations, the angular beaming pattern was found to be narrowly confined to a plane containing the magnetic field…