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Simulation and methods for the data analysis of the hydrogen-deuterium-absorption-cell-experiment on Cassini
Reulke, R.; Warlich, K.; Jahn, H.
The Hydrogen-Deuterium-Absorption-Cell (HDAC) will be flown as part of the UltraViolet Imaging Spectrograph on the Cassini mission with the objective to determine the deuterium-to-hydrogen (D/H) ratio in the exosphere of Titan. The HDAC is a photometer designed to measure separately the H and D resonant scattered solar Lyman alpha radiation. A non…
The solar wind alpha-particle content as a clue for the origin of slow flows
Bavassano, B.; Pietropaolo, E.; Bruno, R.
Some aspects of the variation of the alpha-particle abundance in the solar wind are studied using Ulysses data. We focus on the first mid-latitude phase of the mission, when the spacecraft intermittently enters the fast high-latitude wind, and on the region around the first perihelion passage, when low-latitude wind in conditions of low solar acti…
Verifying the accuracy of the third interplanetary network: localization of the bursting pulsar GRO J1744-28 by triangulation
Cline, T.; Hurley, K.; Kouveliotou, C. +8 more
The bursting pulsar GRO J1744-28 is the first repeating source of intense bursts whose position is accurately known, which has become active since the establishment of the third interplanetary network. We show how observations of this object with Ulysses and BATSE can be used to verify many aspects of the triangulation method. Analysis of the prel…
Cassini radar : system concept and simulation results
Orosei, R.; Picardi, G.; Seu, R. +1 more
The Cassini mission is an international venture, involving NASA, the European Space Agency (ESA) and the Italian Space Agency (ASI), for the investigation of the Saturn system and, in particular, Titan. The Cassini radar will be able to see through Titan's thick, optically opaque atmosphere, allowing us to better understand the composition and the…
Lyα/Hα Ratio of Singly Ionized Helium in Quasars
Zheng, Wei; Fang, Li-Zhi
He II Lyα λ304/Hα λ1640 emission lines are mainly produced by recombination, and their canonical ratio of ~10 may be a sensitive reddening indicator. We obtain the high signal-to-noise ratio optical spectra of two quasars and combine them with the far-ultraviolet spectra that show the He II λ304 emission. For HS 1700+64, the He II λ1640 emission i…
The Intermittently Embedded Herbig Ae/Be Stars ISO and Ground-Based IR Observations
Sitko, M. L.; Grady, C. A.; Grinin, V. P. +7 more
We discuss silicate emission profiles observed with the ISO SWS and ground-based IR observations in a population of intermittently embedded Herbig Ae/Be stars which are viewed edge-on to their polarimetrically identified dust and gas disks. The ISO SWS observations confirm the lack of a simple correlation between system age and the profile shape. …
Wave power dropouts associated with radial field intervals in high speed solar wind
Balogh, A.; McComas, D. J.; Horbury, T. S. +1 more
Examination of 770 days of heliospheric magnetic field data recorded within polar solar wind by the Ulysses spacecraft revealed a number of occasions when the wave power decreased by more than an order of magnitude for several hours. These power dropouts were found to be associated with intervals when the magnetic field was closely aligned with th…
Episodic Mass Loss and Rapid Lithium Enrichment and Depletion in K Giants
de La Reza, R.; Drake, N. A.; da Silva, L.
ISOPHOT S Observations of 3 M Dwarfs
Liebert, James; Leinert, Christoph; Wehrse, Rainer +2 more
The M dwarfs GL 832 (spectral type M2), GL 887 (M1), and GL 1 (M2) have been observed with the ISOPHOT spectrophotometers in the range 2.5-12µm at high signal-to-noise ratios. Since optical and ground based near-infrared data are also available, more than 95 % of the total flux is now covered for these objects. It is seen that between 2.5 µm and a…
Visualization of three-dimensional datasets
Walsh, Robert W.; Ireland, Jack; Galsgaard, Klaus
The effective visualization of three-dimensional (3d) datasets, both observationally and computationally derived, is an increasing problem in solar physics. We present here plots of computational data derived from the 3d reconstruction of the magnetic field of a loop system, rendered as anaglyphs. By combining images of the same 3d object from two…