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Io's Atmosphere and Surface-Atmosphere Interactions
Lellouch, Emmanuel
Our knowledge of Io’s atmosphere has improved dramatically in the last fifteen years, with a wealth of new observational data at millimeter, UV and IR wavelengths, and the development of numerous models describing its horizontal and vertical structure, composition, photochemistry and plasma interaction. Io’s atmosphere is dominantly composed of SO…
The Cassini solar Faraday rotation experiment
Russell, C. T.; Jensen, E. A.; Bird, M. K. +3 more
The Cassini Faraday rotation experiment improves the current understanding of the coronal magnetic field by making the first measurements of the magnetic field within two solar radii of the south pole and by allowing the separation of the changing electron density from the magnetic field during transient crossings of the line of sight. Simultaneou…
A Multiwavelength Study of the X-Ray Sources in NGC 5018
Wu, Kinwah; Tennant, Allyn F.; Swartz, Douglas A. +2 more
The E3 giant elliptical galaxy NGC 5018 was observed with the Chandra X-Ray Observatory's Advanced CCD Imaging Spectrometer for 30 ks on 2001 April 14. Results of the analysis of these X-ray data as well as of complementary optical, infrared, and radio data are reported. Seven X-ray point sources, including the nucleus, were detected. If they are …
Helioseismic Ring Analyses of Artificial Data Computed for Two-dimensional Shearing Flows
Gough, Douglas; Thompson, Michael J.; Toomre, Juri +1 more
The local helioseismological technique of ring analysis has been crucial in the discovery of complex large-scale flows in the Sun's near-surface shear layer. However, current implementations of ring-analysis procedures assume that the flow field is horizontally homogeneous over the analysis region. This assumption is certainly incorrect, and in th…
Abundances of planetary nebulae NGC 2022 , NGC 6818 and IC 4191
Pottasch, S. R.; Beintema, D. A.; Feibelman, W. A.
The ISO and IUE spectra of the elliptical nebulae
Automated Technique For Comparison Of Magnetic Field Inversion Lines With Filament Skeletons From The Solar Feature Catalogue
Zharkova, V. V.; Aboudarham, J.; Zharkov, S. +3 more
We present an automated technique for comparison of magnetic field inversion-line maps from SOHO/MDI magnetograms with solar filament data from the Solar Feature Catalogue created as part of the European Grid of Solar Observations project. The Euclidean distance transform and connected component labelling are used to identify nearest inversion lin…
XMM-Newton and Optical Follow-up Observations of Three New Polars from the Sloan Digital Sky Survey
Brinkmann, J.; Szkody, Paula; Schmidt, Gary D. +7 more
We report follow-up XMM-Newton and optical observations of three new polars found in the Sloan Digital Sky Survey. Simple modeling of the X-ray spectra, and consideration of the details of the X-ray and optical light curves corroborate the polar nature of these three systems and provide further insights into their accretion characteristics. During…
Energetic particle observations from the Ulysses COSPIN instruments obtained during the October-November 2003 events
Dalla, S.; Kunow, H.; Heber, B. +7 more
We report comprehensive observations of solar energetic particle intensities at energies from 0.3 to >100 MeV made by the suite of six Ulysses COSPIN energetic charged particle instruments on the Ulysses spacecraft during the period of intense solar activity in October/November 2003. We also discuss observations of particle anisotropies in sele…
INTEGRAL and XMM-Newton observations of the low-luminosity and X-ray-rich burst GRB 040223
McGlynn, S.; McBreen, S.; Foley, S. +6 more
GRB 040223 was observed by INTEGRAL and XMM-Newton. GRB 040223 has a peak flux of (1.6 ±0.13)×10-8 ergs cm-2 s-1, a fluence of (4.4±0.4)×10-7 ergs cm-2 and a steep photon power law index of -2.3±0.2, in the energy range 20-200 keV. The steep spectrum implies it is an X-ray-rich GRB with emissi…
XMM-Newton Observations of Optically Selected Sloan Digital Sky Survey Clusters
Georgakakis, A.; Georgantopoulos, I.; Plionis, M. +1 more
We explore the X-ray properties of a subset of the optically selected Sloan Digital Sky Survey (SDSS) cluster sample of Goto et al. by analyzing seven public XMM-Newton pointings, with exposure times ranging from ~4 to 46 ks. There are in total 17 SDSS clusters out of which only eight are detected at X-ray wavelengths with f0.5-2keV>…