Search Publications
Hubble Space Telescope observations of Magellanic cloud planetary nebulae: Stellar winds
Vassiliadis, Emanuel
Narrow-band [OIII] 500.7 nm images and ultraviolet spectrophotometry are obtained for ≈20 planetary nebulae (PNe) in the Magellanic Clouds using the Hubble Space Telescope (HST). Four objects show P Cygni-like features in the ultraviolet HST data, and/or broad emission complexes near the HeII 468.6 nm and CIV 580.6 nm lines in ground-based spectra…
Kilometre-wave radio observations of solar type III bursts by ULYSSES compared with decametre-wave observations from the Earth.
MacDowall, R. J.; Lecacheux, A.; Hoang, S. +1 more
Observations of solar type III bursts, made at kilometric frequencies by the radio receiver of the Ulysses Unified Radio and Plasma Wave (URAP) investigation, are compared with simultaneous observations, made at decametric frequencies at the Nancay Radio Astronomy Station of the Paris-Meudon Observatory, during the period following the spacecraft …
The UV O I triplet and H Lyman β pumping in the ζ Aurigae star HR 6902.
Marshall, K. P.
The radiative transfer code MULTI has been used, in conjunction with a model photosphere and chromosphere for the primary star of the ζ Aur system HR 6902, and a 14-level oxygen atomic model which incorporates up-to-date atomic data, to investigate the rôle of photoexcitation and hydrogen Lyman β pumping in the UV O I resonance triplet at 1302.168…
Energetic particle investigation using the ERNE instrument
Vainio, R.; Valtonen, E.; Eronen, T. +9 more
During solar flares and coronal mass ejections, nuclei and electrons accelerated to high energies are injected into interplanetary space. These accelerated particles can be detected at the SOHO satellite by the ERNE instrument. From the data produced by the instrument, it is possible to identify the particles and to calculate their energy and dire…
The preparation and use of atomic data for the SOHO mission.
Lang, J.
An overview of the SOHO mission is given, including brief descriptions of the major spectroscopic instruments CDS and SUMER. The range of ions whose spectra will be observed is discussed in the context of available fundamental atomic data, principally energy levels, transition probabilities and electron excitation rate coefficients. The use of ADA…
HST Observations of the Radio Galaxy MG 1136+1346 (z=1.003)
Dickinson, Mark; Spinrad, Hyron; Stern, Daniel
We present images taken with the prerefurbishment Hubble Space Telescope of the z = 1.003 radio galaxy MG 1136+1346 as part of a morphological study of the high-redshift radio-source population. The galaxy has a bright, unresolved nuclear component which contributes approximately half of the total light in the observed V (F555W) and I (F785LP) ban…
The Swings Effects of the A-X System and v" = 1-0 Band of CO
Kim, Sang-Joon
We have constructed a line-by-line model of the A-X system of CO in order to analyze the CO bands appearing in the UV spectra of comets. The model includes electronic, rotational, vibrational transitions, excitations by solar UV radiation, and effects of neutral and electron collisions. The major bands of the A-X system occur in the 1200 - 1800 A-…
The comet collision with Jupiter: III. The largest impact complex at high resolution
Rogers, J. H.; Miyazaki, I.; Limaye, S. S.
Comet fragments D, G, R, and S all impacted on Jupiter within an 180 range of longitude, and produced a single great dark complex. Using high-resolution maps derived from Hubble Space Telescope and ground-based images, we compile a continuous record of this complex. Many dark spots and streamers developed within it. They did not follow the normal …
Effects of an apparent space dust impact on a position sensing solid state detector aboard the Ulysses spacecraft
Connell, J. J.
The High Energy Telescope (HET) is part of the COsmic and Solar Particle INvestigation (COSPIN) aboard the Ulysses spacecraft. The Ulysses mission is to explore the Heliosphere in three dimensions by passing over the polar regions of the sun. Ulysses achieved it present high inclination (> 80°) solar orbit via a gravitational sling-shot around …
Non-thermal velocities in flare plasmas
Benna, C.; Antonucci, E.; Martin, R. +1 more
The analysis of the profile and intensity of the soft X-ray lines formed in the wavelength range from 1.8 Angstroms to 20 Angstroms, observed with the Soft X-ray Polychromator of the Solar Maximum Mission (SMM), shows that solar flare plasmas are characterized by non-thermal velocities. Flare plasmas in general consist of two components at differe…