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Characteristics of magnetospherically reflected chorus waves observed by CLUSTER
Santolík, O.; Gurnett, D.; Parrot, M. +2 more
Available from http://www.copernicus.org/site/EGU/annales/22/7/2597.htm?FrameEngine=false;
Variations in the Spin Period of the Radio-quiet Pulsar 1E 1207.4-5209
Pavlov, George G.; Zavlin, Vyacheslav E.; Sanwal, Divas
The X-ray source 1E 1207.4-5209 is a compact central object in the G296.5+10.0 supernova remnant. Its spin period of 424 ms, discovered with Chandra, suggests that it is a neutron star. The X-ray spectrum of this radio-quiet pulsar shows at least two absorption lines, the first spectral features discovered in radiation from an isolated neutron sta…
Simultaneous observations of field-aligned beams and gyrating ions in the terrestrial foreshock
Dandouras, I.; Klecker, B.; Lucek, E. A. +14 more
We examine an energetic (2-30 keV) upstream ion event presenting a clear double-peak spectrum observed ∼1 RE upstream from the bow shock. The lower-energy (E ∼ 3.5 keV) peak is associated with an ion beam propagating along the magnetic field direction, while the higher-energy (E ∼ 13 keV) peak is associated with gyrating ions having pit…
XMM-Newton Observation of the Merging Galaxy Cluster A1644
Sarazin, Craig L.; Reiprich, Thomas H.; Tittley, Eric +1 more
We present an XMM-Newton imaging spectroscopy analysis of the galaxy cluster A1644. A1644 is a complex merging system consisting of a main cluster and a subcluster. A trail of cool, metal-rich gas has been discovered close to the subcluster. The combination of results from X-ray, optical, and radio data and a comparison to a hydrodynamic simulatio…
Physical Structure of the Protoplanetary Nebula CRL 618. II. Interferometric Mapping of Millimeter-Wavelength HCN J = 1-0, HCO+ J = 1-0, and Continuum Emission
Sahai, R.; Sánchez Contreras, C.
We present interferometric maps with high angular resolution, 1.1" to 1.9", of the HCO + J=1-0 and HCN J=1-0 emission lines in the protoplanetary nebula CRL 618. These molecules are present in both the slowly (~10-20 km s-1) and rapidly (~200 km s-1) outflowing components of the molecular envelope of CRL 618. The …
Hubble Space Telescope Imaging of Extraplanar Dust Structures in the Edge-On Spiral NGC 4217
Savage, Blair D.; Howk, J. Christopher; Thompson, Thomas W. J.
We present high-resolution (~ 0.1") B, V, and I images of the edge-on Sb galaxy NGC 4217 obtained with the Wide Field Planetary Camera 2 (WFPC2) on-board the Hubble Space Telescope (HST). We make use of these images to study extraplanar (z>0.4 kpc) dust structures visible in absorption against the background stellar light of the galaxy, similar…
Waiting in the Wings: Reflected X-Ray Emission from the Homunculus Nebula
Weis, K.; Davidson, K.; Smith, N. +14 more
We report the first detection of X-ray emission associated with the Homunculus nebula that surrounds the supermassive star η Car. The emission is characterized by a temperature in excess of 100 MK and is consistent with scattering of the time-delayed X-ray flux associated with the star. The nebular emission is bright in the northwestern lobe and n…
Pronounced Long-Term Flux Variability of the Anomalous X-Ray Pulsar 1E 1048.1-5937
Tiengo, A.; Mereghetti, S.; Stella, L. +4 more
We present XMM-Newton and Chandra observations of 1E 1048.1-5937, being the first to show evidence for a significant variation in the X-ray luminosity of this anomalous X-ray pulsar (AXP). While during the first XMM-Newton (2000 December) and Chandra (2001 July) observations the source had a flux consistent with that measured on previous occasions…
Magnetic Field-Minimum Intensity Correlation in Sunspots: A Tool for Solar Dynamo Diagnostics
Norton, Aimee A.; Gilman, Peter A.
Within a sunspot umbra, the continuum intensity is known to be inversely proportional to the magnetic field strength. Studied less is the relationship between the minimum continuum intensity and the maximum field strength of different sunspots. We conduct a test of this global relationship, using brightness ratios and magnetic field data from the …
Geoeffectiveness of interplanetary shocks during solar minimum (1995 1996) and solar maximum (2000)
Echer, E.; Gonzalez, W. D.; Alves, M. V.
Plasma and magnetic field parameter variations across fast forward interplanetary shocks are analyzed during the last solar cycle minimum (1995-1996, 15 shocks), and maximum year 2000 (50 shocks). It was observed that the solar wind velocity and magnetic field strength variation across the shocks were the parameters better correlated with Dst. Sup…