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Ulysses: a summary of the first high-latitude survey
Smith, E. J.; Marsden, R. G.
The unique in-situ observations acquired by the scientific instrumentation on board the Ulysses spacecraft have provided, for the first time, a comprehensive, 3-dimensional view of the heliosphere from the solar equator to the poles near solar minimum. Since beginning its journey out of the ecliptic plane in February, 1992, Ulysses has acquired a …
The heliospheric magnetic field at solar minimum as observed by ULYSSES
Balogh, A.; Horbury, T. S.; Smith, E. J. +1 more
Since February 1992 the Ulysses spacecraft has been in a polar orbit round the Sun, reaching 80 deg heliolatitude over the south pole in September 1994 and over the north pole in July 1995. During this time solar activity has been gradually declining towards its present minimum in mid-1996. We discuss how the large scale configuration of the helio…
Ulysses observations of energetic H3+ ions in Jupiter's magnetosphere
Krupp, N.; Woch, J.; Keppler, E. +3 more
Ulysses was the fifth spacecraft to visit Jupiter. In this paper measurements of energetic H_3^+-ions in the Jovian magnetosphere made by the EPAC (Energetic Particle Composition) instrument onboard Ulysses are presented and compared with formerly published findings from the HI-SCALE instrument also onboard Ulysses.
Ion cyclotron waves in the Jovian magnetosphere
Dougherty, M. K.; Southwood, D. J.; Lachin, A.
Magnetic field data from the inbound Ulysses flyby past Jupiter in February 1992 is examined for evidence of ion cyclotron wave activity. Particular interest has been paid to the near equatorial current sheet within the middle magnetosphere where the field magnitude ranges between 5-60 nT. Power spectral peaks in the ion cyclotron range are easily…
Separation rate of the magnetic field lines observed by ULYSSES at high latitude
Balogh, A.; Erdös, G.; Kóta, J.
Ulysses has observed enhanced magnetic field fluctuations embedded in the fast solar wind originating from the high latitude coronal hole. These fluctuations proved to affect charged particle transport significantly. In this paper we apply a new method to determine the magnetic field line mixing from the actually measured magnetic field.
ERNE observations of energetic particle fluxes
Laitinen, T.; Vainio, R.; Valtonen, E. +7 more
The observations of the ERNE instrument on-board the SOHO spacecraft are analysed. The main period under study is from the beginning of May till mid-October 1996. Only very small energetic particle events were observed. A comparison of the ERNE measurements with energetic particle observations during the two previous solar minima indicates that th…
Recurrences of interplanetary interaction regions at southern solar latitudes and approximate harmonics
Lanzerotti, L. J.; Maclennan, C. G.; Thomson, D. J.
A series of low energy (~60 keV/nucl to several MeV/nucl) interplanetary particle enhancements was measured by the HI-SCALE instrument on the Ulysses spacecraft during the first approximately two-thirds of 1993. At this time Ulysses was located between ~4.3 - 5.0 AU and climbing from ~ 23 deg to ~40 deg south heliolatitude. Spectral analyses of th…
Low energy charged particles in the high latitude heliosphere
Lanzerotti, L. J.; Armstrong, T. P.; Gold, R. E. +3 more
Low energy ion and electron measurements made over the south and north polar regions of the sun by the HI-SCALE instrument on the Ulysses spacecraft during its solar minimum polar passages are summarized. The polar flux levels were considerably reduced in comparison to fluxes in the vicinity of the heliospheric current sheet. Flux variations with …
High resolution solar ultraviolet measurements
Vial, J. -C.; Wilhelm, K.; Curdt, W. +6 more
The increase of our understanding of the processes acting in the solar corona and maintaining it is strongly dependent on the quality of the data that are obtained to check theories. The fine structure of the solar atmosphere seen from the photosphere and extending to the hottest parts of the corona requires data with high resolution in all parame…
Plasma wave observations from the ULYSSES spacecraft's fast heliographic latitude scan
MacDowall, R. J.; Lin, N.; Hess, R. A. +1 more
Plasma wave observations obtained by the Ulysses spacecraft in 1994 and 1995 over a heliographic latitude range of -70 to +70 deg show significantly different wave characteristics inside and outside the streamer belt. Langmuir wave bursts are most commonly found in magnetic holes, especially in fast solar wind. The intensities of ion-acoustic-like…