Search Publications
Missions
Journals
Publication Years
Far-UV emissions from the SL9 impacts with Jupiter
Talavera, A.; Feldman, P. D.; Strobel, D. F. +20 more
Observations with the International Ultraviolet Explorer (IUE) during the impacts of the fragments of comet D/Shoemaker-Levy 9 with Jupiter show far-UV emissions from the impact sites within a ∼10 min time scale. Positive detections of H2 Lyman and Werner band (1230-1620 Å) and H-Lyα emissions are made for impacts K and S, and marginall…
Corotation of Jupiter's three-dimensional magnetosphere
Lanzerotti, L. J.; Maclennan, C. G.; Hawkins, S. E., III +1 more
An understanding of the corotational characteristics of planetary magnetospheres is essential for a complete description and comprehension of the plasma physics of these astrophysical objects. The corotational properties of Jupiter's magnetosphere have been revealed by data from the Voyager and Ulysses spacecraft. The near-equatorial hot plasma sh…
Modulation of galactic cosmic ray particles observed on board the ULYSSES spacecraft
Sierks, H.; Kunow, H.; Wibberenz, G. +9 more
The cosmic ray flux observed with the Kiel Electron Telescope on board the ULYSSES spaceprobe varies with solar activity as well as with heliospheric position. Determination of spatial gradients requires a careful analysis of the influences of the current sheet tilt angle, the number of major solar flares, interplanetary shocks and interaction reg…
The Faint Limit of the Hubble Space Telescope Faint Object Spectrograph and Rejection of the Cosmic-Ray Background
Tytler, David; Davis, Christopher
The faintest object which can be observed with the Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) is set by the detector cosmic-ray background and not by object flux. We use data from Beaver and Lyons to show that 48% of the background counts are from cosmic rays which each generate a near instantaneous burst of two or more counts. S…
Anisotropies of Interstellar Pickup Protons - Implications for Scattering of Low Rigidity (∼1 to 3 MV) Particles
Gloeckler, G.; Fisk, L. A.; Schwadron, N.
Interplanetary Type III Radio Bursts Observed Simultaneously by ULYSSES and ICE
Stone, R. G.; Reiner, M. J.; Hoang, S. +1 more
We analyze two solar type III radio bursts that were observed simultaneously by the ICE and Ulysses spacecraft. Both bursts originated behind the solar limb as viewed from either spacecraft. At the time of these events, ICE was in the ecliptic plane at ∼1 AU and Ulysses was ∼ 35° south of the ecliptic plane at ∼4 AU. For one event on 931117, the r…
VRI photometry of wide double stars with A- type primaries.
Cuypers, J.; Lampens, P.; Sinachopoulos, D. +2 more
We are presenting VRI photometry of 93 wide visual double stars having late B- or A- type primaries, taken from the Annex of Double and Multiple Stars of the HIPPARCOS Input Catalogue. Spectral types have been estimated for most of the primaries and for the majority of the secondaries. 40% of them probably have common origin components, for which …
The broad band energy distribution of the misaligned gamma-ray blazar PKS 0521-365
Maraschi, L.; Ghisellini, G.; Pian, E. +4 more
Simultaneous UV and X-ray observations of the blazar PKS 0521-365 are combined with radio, IR, optical and gamma-ray data taken at different epochs to study the overall emission from 10^9 to 10^23 Hz. The energy distribution declines from the IR to the UV range (alpha_opt-UV = 1.4 +/- 0.1), buthardens at higher frequencies. The remarkably flat X-r…
A method for solving the linearized Boltzmann equation for almost uniformly rotating stellar disks.
Dejonghe, H.; Vauterin, P.
We construct analytical phase-space solutions for perturbations of flat disks by performing a power series expansion for the radius and the velocity coordinates. We show that this approach translates into an elegant mathematical formulation which is easy to use for a wide variety of distribution functions, for as far as resonances do not play a ro…
HST Observations of the DAV White Dwarf G 226--29
Kepler, S. O.; Robinson, E. L.; Nather, R. E.
We observed G 226-29 for 15 hours with the HST and detected two problems in spectrograms obtained with the post-COSTAR Faint Object Spectrograph and the G160L grating. First, using the 1 arcsec entrance aperture with a triple peakup, we found a strong ( =~ 3 %) modulation of the total count rate on a time scale similar to the HST orbital period. S…