Search Publications
Low-energy electrons in Saturn's inner magnetosphere and their role in interchange injections
Coates, A. J.; Young, D. T.; Burch, J. L. +2 more
Since the days of Pioneer 11 and the Voyager missions, electrons have shown an unexplained peak in the data at approximately 7.5 Saturn radii (RS). To investigate this peak, we examine near-equatorial electron energy flux data (±10°) from the Cassini Plasma Spectrometer Electron Spectrometer from 1 July 2004 through 10 August 2007. When…
Discovery of Diffuse Hard X-Ray Emission Around Jupiter with Suzaku
Uchiyama, Y.; Negoro, H.; Miyoshi, Y. +4 more
We report the discovery of diffuse hard (1-5 keV) X-ray emission around Jupiter in a deep 160 ks Suzaku X-ray Imaging Spectrometer data. The emission is distributed over ~16 × 8 Jovian radius and spatially associated with the radiation belts and the Io Plasma Torus (IPT). It shows a flat power-law spectrum with a photon index of 1.4 ± 0.2 with the…
Measurements of Filament Height in Hα and EUV 304 Å
Xu, Yan; Jing, Ju; Wang, Haimin
In this study, we present the three-dimensional (3D) configuration of a filament observed by STEREO and the Global High Resolution H-alpha Network (GHN) in EUV 304 Å and Hα line center, respectively. This was the largest filament located close to the active region NOAA 10956 that produced a small B9.6 flare and two Coronal Mass Ejections (CMEs) on…
WIYN Imaging of the Globular Cluster Systems of the Spiral Galaxies NGC 891 and NGC 4013
Rhode, Katherine L.; Young, Michael D.; Windschitl, Jessica L.
We present results from a WIYN 3.5 m telescope imaging study of the globular cluster (GC) systems of the edge-on spiral galaxies NGC 891 and NGC 4013. We used the 10' × 10' Minimosaic Imager to observe the galaxies in BVR filters to projected radii of ~20 kpc from the galaxy centers. We combined the WIYN data with archival and published data from …
A HIFI preview of warm molecular gas around χ Cygni: first detection of H2O emission toward an S-type AGB star
de Graauw, Th.; Olofsson, H.; Marston, A. P. +24 more
Aims: A set of new, sensitive, and spectrally resolved, sub-millimeter line observations are used to probe the warm circumstellar gas around the S-type AGB star χ Cyg. The observed lines involve high rotational quantum numbers, which, combined with previously obtained lower-frequency data, make it possible to study in detail the chemical and …
Plasma Near the Heliosheath: Observations and Interpretations
Wang, C.; Richardson, J. D.
Voyager 2 (V2) has observed heliosheath plasma since 2007 August. The plasma flux decreases by 25% before the termination shock (TS), then, as V2 moved into the heliosheath, the plasma density, temperature, and flux all decreased by an additional factor of 2. We suggest three effects combine to cause these decreases. (1) V2 moved into the lower-fl…
Diagnosing Circumstellar Debris Disks
Hahn, Joseph M.
A numerical model of a circumstellar debris disk is developed and applied to observations of the circumstellar dust orbiting β Pictoris. The model accounts for the rates at which dust is produced by collisions among unseen planetesimals, and the rate at which dust grains are destroyed due to collisions. The model also accounts for the effects of r…
The WHISPER Relaxation Sounder and the CLUSTER Active Archive
Lointier, G.; Décréau, P. M. E.; Facskó, G. +8 more
The Waves of HIgh frequency and Sounder for Probing of Electron density by Relaxation (WHISPER) instrument is part of the Wave Experiment Consortium (WEC) of the CLUSTER mission. With the help of the long double sphere antennae of the Electric Field and Wave (EFW) instrument and the Digital Wave Processor (DWP), it delivers active (sounding) and n…
Statistical Analysis of the very Quiet Sun Magnetism
Asensio Ramos, A.; Martínez González, M. J.; Manso Sainz, R. +2 more
The behavior of the observed polarization amplitudes with spatial resolution is a strong constraint on the nature and organization of solar magnetic fields below the resolution limit. We study the polarization of the very quiet Sun at different spatial resolutions using ground- and space-based observations. It is shown that 80% of the observed pol…
Investigation of the transient X-ray burster IGR J17380-3749 discovered by the INTEGRAL observatory
Grebenev, S. A.; Chelovekov, I. V.
Details of the discovery (in February 2004) and results of subsequent (in 2004-2009) INTEGRAL observations of the transient X-ray burster IGR J17380-3749 (IGR J17379-3747) are presented. Over the period of its observations, the INTEGRAL observatory recorded two hard X-ray flares and one type I X-ray burst from the source, which allowed the nature …