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  • Other Sources  (13)
  • 1
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    Ulysses at Jupiter - An overview of the encounter (1992)
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    Publication Date: 2011-08-24
    Description: Preliminary scientific findings of the Ulysses mission that was launched in October 1990 and arrived at Jupiter in Februrary 1992 are reviewed. The mission was aimed at using the gravity field of Jupiter to redirect the spacecraft to the sun's polar regions, which will be traversed in 1994 and 1995. Major results include possible entry into the polar cap; the identification of magnetospheric ions originating from Jupiter's ionsphere; Io, and the solar wind; observation of longitudinal asymmetries in density and discrete wave-emitting regions of the Io plasma torus; the presence of counter-streaming ions and electrons, field-aligned currents, and energetic electron and radio bursts in the dusk sector on high-latitude magnetic field lines; and the identification of the magnetic field direction in the dusk sector, which is indicative of tailward convection.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Science (ISSN 0036-8075); 257; 5076,
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  • 2
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    The Ulysses mission (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The Ulysses mission is unique in the history of the exploration of solar system by spacecraft. The path followed by Ulysses will make it possible, for the first time, to explore the heliosphere within a few astronomical units of the sun over the full range of heliographic latitudes, thereby providing the first characterization of the uncharted third heliospheric dimension. Advanced scientific instrumentation carried on board the spacecraft is designed to measure the properties of the heliospheric magnetic field, the solar wind, the sun/wind interface, solar radio bursts and plasma waves, solar energetic particles and galactic cosmic rays, solar X-rays, and interplanetary/interstellar neutral gas and dust. Ulysses will also be used to detect cosmic gamma-ray bursts and search for gravitational waves. The mission, a collaboration between ESA and NASA, was launched in October 1990 and employs a Jupiter gravity-assist to achieve the trajectory extending to high solar latitudes. The paper describes the characteristics of the Ulysses mission in order to establish a framework within which to better understand the objectives and goals of the scientific investigations.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Astronomy and Astrophysics Supplement Series (ISSN 0365-0138); 92; 2, Ja
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  • 3
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    The Ulysses mission in the high latitude heliosphere (1990)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Ulysses, a joint ESA/NASA mission launched in October 1990, will be the first to explore the high latitude heliosphere. Launch will be from the Shuttle and a Jupiter gravity assist will be used to send the spacecraft first over the southern solar pole approximately three and one half years after launch and then over the northern solar pole one year later. Instruments will be carried to study the solar wind, the heliospheric magnetic field, energetic solar particles, galactic cosmic rays, solar X-rays, cosmic gamma rays, cosmic dust and interstellar neutral helium. The radio signals used to track and transmit spacecraft data will be used also to sound the corona and to search for gravitational waves.
    Keywords: SOLAR PHYSICS
    Type: In: Observatories in earth orbit and beyond (A93-23401 07-89); p. 307-313.
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  • 4
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    Ulysses above the sun's south pole: an introduction (1995)
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    Publication Date: 2011-08-24
    Description: Ulysses has explored the field and particle environment of the sun's polar region. The solar wind speed was fast and nearly constant above -50 degrees latitude. Compositional differences were observed in slow (low-latitude) solar wind and in fast (high-latitude) solar wind. The radial magnetic field did not change with latitude, implying that polar cap magnetic fields are transported toward the equator. The intensity of galactic cosmic rays was nearly independent of latitude. Their access to the polar region is opposed by outward-traveling, large amplitude waves in the magnetic field.
    Keywords: Life Sciences (General)
    Type: Science (ISSN 0036-8075); Volume 268; 5213; 1005-7
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  • 5
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    The scientific mission of Ulysses (1990)
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    Publication Date: 2011-08-19
    Description: The major aims of the Ulysses' scientific investigations of the heliosphere at all latitudes are described. Missions goals include the assessment of the global three-dimensional properties of the interplanetary magnetic field and solar wind, the study of the composition of the solar wind plasma at different heliographic latitudes, and the study of the acceleration of energetic particles in solar flares. Waves, shocks and other discontinuities in the solar wind will be investigated through sampling of various plasma conditions, and interplanetary dust and cosmic rays will be analyzed. Other important goals include the search for gamma-ray-burst sources and for low-frequency gravitational waves by using the spacecraft's radio communication link. Achievement of the Ulysses' solar pole trajectory, which will utilize both launch vehicle thrust and gravitational pull, is also described.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: ESA Bulletin (ISSN 0376-4265); 63, A
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  • 6
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    Ulysses - A journey above the sun's poles (1991)
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    Publication Date: 2011-08-24
    Description: Neither the heating of the solar corona nor its acceleration to form the solar wind are well understood; the Ulysses spacecraft launched on October 6, 1990, will address these questions through observations of the polar regions. These observations will give special attention to the presence and properties of waves that have proposed either to heat the corona, to help accelerate the solar wind, or to heat the wind after it escapes from the sun. Another major objective of Ulysses is to map the solar magnetic field in the polar caps.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: EOS (ISSN 0096-3941); 72; 241
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  • 7
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    Ulysses - A journey above the sun's poles (1991)
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    Publication Date: 2011-08-19
    Description: The mission objectives and orbit parameters of the NASA/ESA Ulysses project are discussed, and the phenomena to be investigated are reviewed in terms of existing knowledge and mission expectations. The sun, solar corona, and the solar wind are described, and the effects of the solar wind on the heliosphere are discussed. The composition of the interstellar medium is also reviewed because the Ulysses mission involves the analysis of interstellar grains, galactic radiation, and the effects of cosmic rays on the magnetic field. The present status of the trajectory of the Ulysses satellite is that it is currently traveling toward Jupiter for a gravity assist to send it out of the ecliptic plane. The focus of the mission is the investigation of the solar corona which can yield important data regarding the aforementioned phenomena.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: Earth in Space (ISSN 1040-3124); 4; 10-14
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  • 8
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    Ulysses - The first high-latitude heliospheric mission (1989)
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    Publication Date: 2011-08-19
    Description: The Ulysses mission will, for the first time, explore the heliosphere within a few astronomical units of the sun over the full range of heliographic latitudes, thereby providing the first characterization of the uncharted third dimension. Highly sophisticated scientific instrumentation carried on board the spacecraft is designed to measure the properties of the solar wind, the sun/wind interface, the heliospheric magnetic field, solar radio bursts and plasma waves, solar X-rays, solar and galactic cosmic rays, and interplanetary/interstellar neutral gas and dust. This collaborative ESA/NASA mission, scheduled for launch in October 1990, will use a Jupiter gravity-assist to achieve a trajectory extending to high solar latitudes /1,2/.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Advances in Space Research (ISSN 0273-1177); 9; 4, 19
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  • 9
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    The Heliosphere During the Declining Solar Cycle; Symposium D1.1 of COSPAR Scientific Assembly, 30th, Hamburg, Germany, July 11-21, 1994 (1995)
    In:  Other Sources
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    Publication Date: 2019-03-30
    Description: The conference discussed the heliosphere during the declining solar cycle. Topics covered included: manifestations of solar activity, the solar wind, ion pick-up and anomalous cosmic rays, the interplanetary magnetic field, cosmic ray modulation, co-rotating interaction regions, and the heliosphere boundary, as well as several related topics.
    Keywords: SOLAR PHYSICS
    Type: Advances in Space Research (ISSN 0273-1777); 16; 9
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  • 10
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    Expanding our knowledge of the heliosphere (1995)
    In:  Other Sources
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    Publication Date: 2019-04-02
    Description: Milestones on our road to understanding the heliosphere between 1950 and 1988 are recalled. Among these are early studies of solar energetic particles suggesting a heliospheric boundary at 5 AU, the discovery of the solar wind and the sectored nature of the interplanetary magnetic field. Recent results, particularly from the Ulysses spacecraft, confirm the arrival of neutrals from interstellar space, the pick-up of singly charged ions by the solar wind and the acceleration of these ions to become anomalous cosmic rays. Two distinct solar wind regimes have been discovered. At low heliolatitudes a highly variable solar wind blows at an average speed around 450 km/s, while at high latitudes a relatively smooth 750 km/s flow is observed. No indicators of a dipole-like magnetic field have been seen by Ulysses in solar polar latitudes. The cosmic radiation increase with latitude is much smaller than predicted. The status of and plans for the Voyager 1 and 2, Pioneer 10 and 11, and Ulysses spacecraft are outlined.
    Keywords: SOLAR PHYSICS
    Type: Advances in Space Research (ISSN 0273-1177); 16; 9; p. (9)5-(9)23
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