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ULYSSES energetic ion observations during the declining phase of solar cycle 22
Sanderson, T. R.
The Ulysses spacecraft was launched in October 1990, just after the maximum of solar cycle 22. Part of the journey to Jupiter was during one of the most active periods of solar activity recorded so far. Solar activity remained exceptionally high for many months after launch, solar energetic particles dominating the particle observations at Ulysses…
The First Search for a Gamma-Ray Burst Quiescent Counterpart in the Extreme Ultraviolet with EUVE
Hurley, K.; Kouveliotou, C.; Li, P. +3 more
The opening of the extreme ultraviolet window by the Extreme Ultraviolet Explorer (EUVE) satellite has provided the unique opportunity to perform the first search for a quiescent gamma-ray burst counterpart at these wavelengths. Such emission might be expected if some bursts are related to nearby hot neutron stars or neutron stars with accretion d…
Galactic Cosmic Ray Propagation at Low Energies: The Interstellar Medium and Partial Cross Sections
Thayer, M. R.
Schmidt plate astrometric reductions using preliminary HIPPARCOS and TYCHO data
Makarov, V. V.; Evans, D. W.; Bastian, U. +9 more
New reductions of Schmidt plate measurements have been performed, using preliminary Hipparcos and Tycho data for the astrometric reference stars. The measurements reported here have been obtained with the MAMA automatic measuring machine of the Centre d'Analyse des Images in Paris. The Hipparcos data considered, the `combined 30-month solution', o…
Blue stragglers and horizontal branch stars in the core of the globular cluster M3.
Burgarella, D.; Paresce, F.; Quilichini, V.
The core of the Galactic globular cluster Messier 3 (NGC 5272) has been imaged through the f/96-F140W, f/96-F220W and f/96-F346M ultraviolet filters of the Faint Object Camera onboard the Hubble Space Telescope (HST) down to an ultraviolet magnitude of ~20. We measure a high specific frequency of blue stragglers stars (BSS), f_BSS_=0.29 in the obs…
UV Spectrophotometry of the Hottest Stars from the Southern HK Survey
Beers, Timothy C.; Drilling, John S.
Low-resolution UV spectra have been obtained with the long- and short-wavelength lUE cameras for seven of the hottest stars identified in the ongoing HK objective-prism/interference-filter survey begun by Beers, Preston, & Shectman. These stars are a subset of a sample of some 25,000 stars at high galactic latitude whose objective-prism spectr…
Is this orbit really necessary? III. On the use of Hipparcus double-star measurements for orbit computation.
Dommanget, J.
In this paper the advisability of computing some double star orbits is discussed. As a conclusion, it appears that the Hipparcos double star measurements of relative positions will not essentially contribute to an improvement in our knowledge of double star orbits.
Structure of mass-loading shocks. 2. Comparison of theory and observation at comet Halley
Coates, A. J.; Neubauer, F. M.; Reme, H. +2 more
The multifluid diffusive model of G. P. Zank et al. (1994), which describes the interaction of the solar wind with a cometary plasma in the outer coma, has been used to model the structure of the Halley bow shock. The theoretical results are compared to in situ observations made by Giotto. We compare the solar wind and cometary ion number densitie…
Measurement of anomalous cosmic ray oxygen at heliolatitudes ∼25° to ∼64°
Simnett, G. M.; Pick, M.; Anderson, K. A. +8 more
We report measurements of the oxygen component (0.5 - 22 MeV/nucl) of the interplanetary cosmic ray flux as a function of heliolatitude. The measurements reported here were made with the Wart telescope of the HI-SCALE low energy particle instrument on the Ulysses spacecraft as the spacecraft climbed from ∼24° to ∼64° south solar heliolatitude duri…
Unusual wave phenomena near interplanetary shocks at high latitudes
MacDowall, R. J.; Stone, R. G.; Thejappa, G. +1 more
We report on several interplanetary shocks that are unusual because waves at about 10 Hz are highly electrostatic in the upstream region yet highly electromagnetic in the downstream region. These shocks, detected by the Unified Radio and Plasma Wave Experiment (URAP) on Ulysses are supercritical reverse shocks, which occurred predominantly at high…