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Sulfur abundances in the solar wind measured by SWICS on Ulysses
Geiss, J.; Galvin, A. B.; Ipavich, F. M. +4 more
One of the nine experiments on Ulysses (launched October, 1990), the Solar Wind Ion Composition Spectrometer, utilizes an energy per charge deflection system along with time of flight technology to uniquely determine the mass and mass per charge of solar wind particles. Thus the composition of various solar wind types can be analyzed. Using the SW…
Solar wind composition and expectations for high solar latitudes
Geiss, J.; von Steiger, R.
Instruments on board the Ulysses spacecraft are to investigate, for the first time, the solar wind in the three principal domains of solar latitude. (1) During Ulysses' flight in the ecliptic plane the solar wind near the current sheet was continuously measured, and its composition was determined with unprecedented sensitivity and mass resolution …
The low-frequency interplanetary radiation
Kurth, W. S.
Observations of the low-frequency interplanetary radiation have continued, although no major activity has begun since mid-1991. Theoretical work has been completed which suggests that the long-speculated source at the termination shock is feasible and could at least qualitatively account for several aspects of the observations, although some diffi…
Initial results from the solar flare X-ray observations with ulysses
Hurley, K.; Sommer, M.; Kane, S. R. +1 more
The Solar X-Ray/Cosmic Gamma-Ray Burst Experiment aboard the Ulysses spacecraft measures hard X-ray spectra in the nominal energy range 15-150 keV, which can be changed by ground command. Since the experiment turn-on on 11 November 1990, it has recorded hard X-ray emission from ~100 solar flares of GOES soft X-ray class > M and several hundred …
Optical, X-ray and γ-ray observations of compact objects in globular clusters
Grindlay, J. E.
In the past three years, a new era of study of globular clusters has begun with multiwavelength observations from the current generation of astronomical telescopes in space. We review the recent results obtained from our studies of compact binaries and x-ray sources in globulars with ROSAT and HST as well as our balloon-borne hard x-ray telescope …
Dust in the planetary system
Grün, E.
A continuous spectrum of particulates ranging from m-sized objects down to molecular sizes is found almost everywhere in the planetary system: in interplanetary space and surrounding planets. Remote observations and in situ analysis provide information on their abundance and properties. Zodiacal dust particles displayed their low eccentricity, low…
Pulsar studies with GRO-COMPTEL
Strong, A. W.; Schönfelder, V.; Kuiper, L. +9 more
Pulsar measurements performed by the experiment COMPTEL, aboard the Compton Gamma Ray Observatory, are described. The main results refer to the Crab and Vela pulsars whose pulse shape characteristics are given in some detail and light curves are compared with those above 50 MeV, as observed by the COS-B satellite. No other gamma-ray pulsars have b…
Anisotropy measurements and spectra from a solar proton event in March 1991
Balogh, A.; Forsyth, R. J.; Cowley, S. W. H. +2 more
We use observations from the Anisotropy Telescopes on the Ulysses spacecraft to determine the omnidirectional flux profile of protons in the energy range 0.7 - 1.3 MeV, during the solar proton event that began on 23 Mar 1991. We also show the spectral index throughout the event at 0.7 - 2.2 MeV and at 2.2 - 6.5 MeV, with three example spectra, one…
Ulysses-its status and prospects
Wenzel, K. -P.
The Ulysses spacecraft is in a high-inclination solar orbit to reach the south polar regions of the Sun in mid-1994 and the north polar regions about one year later. The spacecraft and its nine scientific instruments are in good health. An extended mission, i.e. a second orbit with polar passes about half an 11-year solar cycle later, is scientifi…
Observing the Solar Wind Between 1 and 4 AU with the Radio Receiver on Ulysses
Pantellini, F.; Forsyth, R. J.; Stone, R. G. +8 more