Search Publications
X-Ray Absorption and an X-Ray Jet in the Radio-loud Broad Absorption-line Quasar PG 1004+130
Brandt, W. N.; Garmire, G. P.; Gallagher, S. C. +4 more
We investigate the X-ray properties of PG 1004+130, a radio-loud broad absorption-line (BAL) quasar with a hybrid FR I/II radio morphology. This optically bright, low-redshift quasar was undetected by Einstein, marking it as anomalously X-ray weak relative to other radio-loud quasars. The 22.2 ks XMM-Newton and 41.6 ks Chandra observations present…
On the CME velocity distribution
Chen, P. F.; Fang, C.; Chen, A. Q.
Context: .Coronal mass ejections (CMEs) are often categorized into flare-associated and filament-associated types, which logically is incomplete since there are many CMEs of the intermediate type.
Aims: .With this new classification, this paper aims to reexamine whether flare-associated CMEs and filament eruption-associated CMEs have distinct…
The Transparency of Solar Coronal Active Regions
Schmelz, J. T.; Brickhouse, N. S.
Resonance scattering has often been invoked to explain the disagreement between the observed and predicted line ratios of Fe XVII λ15.01 to Fe XVII λ15.26 (the ``3C/3D'' ratio). In this process photons of λ15.01, with its much higher oscillator strength, are preferentially scattered out of the line of sight, thus reducing the observed line ratio. …
Molecular line emission in HH54: a coherent view from near to far infrared
McCoey, C.; Nisini, B.; Cabrit, S. +4 more
Aims.We present a detailed study of the infrared line emission (1-200 µm) in the Herbig-Haro object HH54. Our database comprises: high- (R ~ 9000) and low- (R ~ 600) resolution spectroscopic data in the near-infrared band (1-2.5 µm); mid-infrared spectrophotometric images (5-12 µm); and, far-IR (45-200 µm, R ~ 200) spectra …
The Spiral Host Galaxy of the Double Radio Source 0313-192
White, Raymond E., III; Keel, William C.; Owen, Frazer N. +1 more
We present new Hubble Space Telescope (HST), Gemini South, and Chandra observations of the radio galaxy 0313-192, which hosts a 350 kpc double source and jets, even though previous data have suggested that it is a spiral galaxy. We measure the bulge scale and the luminosity, radial, and vertical profiles of disk starlight and consider the distribu…
Substorm associated magnetotail energetic electrons pitch angle evolutions and flow reversals: Cluster observation
Lucek, E.; Fritz, T. A.; Wu, P. +1 more
The Cluster satellites observed a distinct pattern in the evolution of energetic electron pitch angle distributions on November 13, 2003, in the mid-tail (radius >10RE) associated with intensifications of these electron fluxes that accompanied an observed local dipolarization of the magnetic field. The intensity of electrons (20-200 …
Ripples observed on the surface of the Earth's quasi-perpendicular bow shock
Horbury, T. S.; Lucek, E. A.; Burgess, D. +1 more
Multipoint measurements from Cluster of a particularly slow encounter with the Earth's bow shock are presented. The shock is classified as high Mach number, quasi-perpendicular, and high plasma beta. Coherent oscillations of the plasma density and the magnetic field amplitude are seen in the foot and ramp of the shock with period approximately 15 …
Forces governing coronal mass ejections
Vršnak, B.
Kinematics of CMEs is analyzed to get an insight into the properties of forces partaking in the eruption. It is demonstrated that the Lorentz force plays a dominant role within a distance of a few solar radii. In the distance range 1 30 solar radii, the inferred values of the Lorentz-force acceleration aL on average decrease with the he…
Dust devils on Mars observed by the High Resolution Stereo Camera
Greeley, Ronald; Pätzold, Martin; Neukum, Gerhard +2 more
Fourteen active dust devils were observed by the High Resolution Stereo Camera (HRSC) on Mars Express, which enable the first analysis of the forward speed of dust devils on Mars determined from orbit. Results show speeds on the order of 20 m/s, which compares favorably with values of the wind profiles estimated from the Martian Climate Database f…
On-ground characterization of Rosetta/VIRTIS-M. I. Spectral and geometrical calibrations
Piccioni, G.; Capaccioni, F.; Coradini, A. +5 more
The complete characterization of complex imaging spectrometers, such as VIRTIS-M (visual infrared thermal imaging spectrometer) aboard the Rosetta mission, requires a detailed and prolonged activity starting with the instrument integration and continuing during the entire operational life of the experiment. In this article we report the main exper…