Search Publications
Diamagnetic and Expansion Effects on the Observable Properties of the Slow Solar Wind in a Coronal Streamer
Velli, M.; Dahlburg, R. B.; Einaudi, G. +1 more
The plasma density enhancements recently observed by the Large-Angle Spectrometric Coronagraph (LASCO) instrument on board the Solar and Heliospheric Observatory (SOHO) spacecraft have sparked considerable interest. In our previous theoretical study of the formation and initial motion of these density enhancements it is found that beyond the helme…
Dust in spiral galaxies: global properties
Stevens, J. A.; Gear, W. K.; Amure, M.
We present and analyse high-quality Submillimetre Common-User Bolometer Array (SCUBA) 850- and 450-µm images of 14 local spiral galaxies, including the detection of dust well out into the extended disc in many cases. We use these data in conjunction with published far-infrared flux densities from IRAS and ISO, and millimetre-wave measurement…
A spectroscopic search for the non-nuclear Wolf-Rayet population of the metal-rich spiral galaxy M 83
Schmutz, W.; Crowther, P. A.; Schild, H. +1 more
We present a catalogue of non-nuclear regions containing Wolf-Rayet stars in the metal-rich spiral galaxy M 83 (NGC 5236). From a total of 283 candidate regions identified using He ii λ4686 imaging with VLT-FORS2, Multi Object Spectroscopy of 198 regions was carried out, confirming 132 WR sources. From this sub-sample, an exceptional content of ~1…
A far UV study of interstellar gas towards HD 34078: High excitation H2 and small scale structure
Le Petit, F.; Roueff, E.; Andersson, B. -G. +5 more
To investigate the presence of small scale structure in the spatial distribution of H2 molecules we have undertaken repeated FUSE UV observations of the runaway O9.5V star, HD 34078. In this paper we present five spectra obtained between January 2000 and October 2002. These observations reveal an unexpectedly large amount of highly exci…
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…