Search Publications
Modulation recovery of high energy electrons: ULYSSES observations
Sierks, H.; Kunow, H.; Heber, B. +5 more
The ULYSSES spacecraft, launched in Oct 1990 near solar maximum, continues its investigation journey toward the southern polar pass during the decaying phase of solar cycle 22. One of the primary aim of its mission, namely the study of the cosmic-ray solar modulation in the three-dimensional heliosphere, has really started when exploring high latt…
Results from the corrected hubble space telescope
Kinney, A. L.
Findings from the refurbished Hubble Space Telescope are presented, including imaging of asymmetrical circumstellar material around pre-main sequence stars in the Orion Nebula, discovery of a triple ring system in the supernova remnant 1987a, and the measurement of high velocity in the central region of the nucleus of the active galaxy M87 which p…
Interplanetary magnetic field during the Giotto encounter and the induced magnetosphere of comet Halley
Neubauer, F. M.; Israelevich, P. L.; Ershkovich, A. I.
The direction of the interplanetary magnetic field (IMF) which governs the orientation of the Halley's magnetosphere was restored. Giotto magnetic and plasma data were represented in the coordinate system rotating with the IMF.
Ultraviolet eclipse observations of an accretion disk wind
Raymond, J. C.; Mason, K. O.; Cordova, F. A. +3 more
We present eclipse time series of ultraviolet Civ 1549Angstroms and Heii line profiles in the spectrum of the nova-like variable UX UMa, obtained using the Goddard High Resolution Spectrometer (GHRS) on board the Hubble Space Telescope (HST). These data provide important new insights into the origin of these mainly wind-formed lines. Specifically,…
Ulysses charged particle measurements between 1 and 5 AU from the sun
Smith, E. J.; Wenzel, K. -P.; Page, D. E.
Proton fluxes obtained by two instruments carried on the ESA/NASA Ulysses spacecraft are reported for the period from launch in October 1990 till Jupiter encounter in February 1992. Proton energy ranges are 24-59, 71-99, 130-320, 320-2100 and > 2100 MeV. The Sun was very active during this period, the events of March 1991 being some of the larg…
Observations of the solar corona with ulysses: Expectations above the polar regions
Marsden, R. G.; Wenzel, K. -P.
During its prime mission phase, the Ulysses space probe will fly above both solar poles, providing an unprecedented opportunity to study the high latitude regions of the solar corona. The timing of the polar passes (mid-1994 and mid-1995) coincides with solar minimum, corresponding to a coronal configuration consisting of well-developed polar coro…
The Ulysses neutral gas experiment: Determination of the velocity and temperature of the interstellar neutral helium
Rosenbauer, H.; Witte, M.; Banaszkiewicz, M. +1 more
A new technique to directly detect low energy neutral helium has been developed and successfully used in space for the first time. It makes possible the in-situ measurement of the local angular distribution of the flow of interstellar neutral helium in the inner heliosphere. Based on the transformation of a velocity distribution, using Liouville's…
Magnetic fields throughout the heliosphere
Smith, Edward J.
Measurements of the heliospheric magnetic field made over the last several years are surveyed with emphasis on Pioneer 11 observations near 35 AU and Ulysses observations between 1 and 5 AU. The increase in field magnitude at 1 AU near the recent sunspot maximum is also seen at Pioneer 11. Extrapolation of the magnitude and azimuthal component of …
Propagation of jovian electrons in and out of the ecliptic
Sierks, H.; Kunow, H.; Wibberenz, G. +5 more
Since its switch-on in Oct. 90, the Kiel Electron Telescope onboard Ulysses has detected many quiet time increases of the flux of 3-30 MeV electrons, known to originate from Jupiter. We report on the long term variations of this flux for the Ulysses ecliptic journey, and at the beginning of the out of ecliptic phase. They are well accounted for by…
Solar wind composition measurements by the Ulysses SWICS experiment during transient solar wind flows
Geiss, J.; Galvin, A. B.; Ipavich, F. M. +3 more
For the March/April 1991 time period, the alpha/proton abundance ratio, the proton kinetic temperature and speed distributions, and the relative abundance of O+7 to O+6 is determined over each 13-minute duty cycle of the Solar Wind Ion Composition Spectrometer (SWICS) experiment on Ulysses. The ratio (as a relative measure of ionization temperatur…