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Cluster multispacecraft observations at the high-latitude duskside magnetopause: implications for continuous and component magnetic reconnection
Lundin, R.; Balogh, A.; André, M. +13 more
We report multispacecraft Cluster observations of magnetic reconnection at the high-latitude magnetopause/magnetospheric boundary layer (MP/BL) under mainly northward interplanetary magnetic field (IMF) conditions. The event we study is on 3 December 2001 when the Cluster spacecraft were skimming the high-latitude duskside MP/BL during a period of…
Reconnection sites of spatial cusp structures
Yeoman, T. K.; Fuselier, S. A.; Reme, H. +4 more
The interconnection of the interplanetary magnetic field with the geomagnetic field is thought to be the dominant process for mass, energy, and momentum transfer from the magnetosheath into the magnetosphere. Downward precipitating ions from the reconnection site are observed in the cusp by polar orbiting satellites and exhibit sudden changes in t…
A Mode-Fitting Methodology Optimized for Very Long Helioseismic Time Series
Korzennik, S. G.
I describe and present the results of a newly developed fitting methodology optimized for very long time series. The development of this new methodology was motivated by the fact that we now have more than half a decade of nearly uninterrupted observations by the Global Oscillation Network Group (GONG) and the Michelson Doppler Imager (MDI), with …
Evidence of a Starburst within 9 Parsecs of the Active Nucleus of NGC 1097
Filippenko, A. V.; Storchi-Bergmann, T.; Wilson, A. S. +4 more
We report evidence of a recent burst of star formation located within 9 pc of the active nucleus of NGC 1097. The observational signatures of the starburst include UV absorption lines and continuum emission from young stars observed in a small-aperture Hubble Space Telescope spectrum. The burst is <= a few × 106 yr old, has a mass of…
Close binary companions of the HAeBe stars LkHα 198, Elias 1, HK Ori and V380 Ori
Duschl, W. J.; Weigelt, G.; Hofmann, K. -H. +5 more
We present diffraction-limited bispectrum speckle interferometry observations of four well-known Herbig Ae/Be (HAeBe) stars,
The onset of solar energetic particle events: prompt release of deka-MeV protons and associated coronal activity
Klein, K. -L.; Posner, A.
Between 1996 and 2002, the COSTEP particle instrument aboard the SoHO mission observed 18 solar energetic particle events where the release times of protons up to 54 MeV could be determined to within an uncertainty of about ten minutes, and where metre wave imaging observations with the Nançay Radioheliograph were available. In six of them the pro…
A Hubble Space Telescope Snapshot Survey of Dynamically Close Galaxy Pairs in the CNOC2 Redshift Survey
Simard, L.; Carlberg, R. G.; Pritchet, C. J. +3 more
We compare the structural properties of two classes of galaxies at intermediate redshift: those in dynamically close galaxy pairs, and those that are isolated. Both samples are selected from the Canadian Network for Observational Cosmology field galaxy redshift survey (CNOC2) and have redshifts in the range 0.1<z<0.6. Hubble Space Telescope …
Discovery and monitoring of the likely IR counterpart of SGR 1806-20 during the 2004 γ-ray burst-active state
Covino, S.; Campana, S.; Götz, D. +9 more
The sky region including the Chandra position of SGR 1806-20 was monitored in the IR band during 2004, following its increased high energy bursting activity. Observations were performed using NAOS-CONICA, the adaptive optics IR camera mounted on Yepun VLT, which provided images of unprecedented quality (FWHM better than 0.1 arcsec). After the 2004…
Self-Consistent Dynamic Models of Steady Ionization Fronts. I. Weak-D and Weak-R Fronts
Henney, W. J.; Ferland, G. J.; Williams, R. J. R. +1 more
We present a method for including steady state gas flows in the plasma physics code Cloudy, which was previously restricted to modeling static configurations. The numerical algorithms are described in detail, together with an example application to plane-parallel ionization-bounded H II regions. As well as providing the foundation for future appli…
A Candidate Neutron Star Associated with Galactic Center Supernova Remnant Sagittarius A East
Maeda, Yoshitomo; Garmire, Gordon P.; Baganoff, Frederick K. +6 more
We present imaging and spectral studies of the supernova remnant (SNR) Sagittarius (Sgr) A East from deep observations with Chandra. The spatially resolved spectral analysis of Sgr A East reveals the presence of a two-temperature thermal plasma (kT~1 and 5 keV) near the center of the SNR. The central region is dominated by emission from highly ion…