Search Publications
Cosmic ray modulation in a non-spherical heliosphere during solar minimum conditions
Potgieter, M. S.; Haasbroek, L. J.
It is expected that the position of the modulation boundary in the equatorial and polar regions of the heliosphere depends on solar activity and possibly also on the polarity of the heliospheric magnetic field. In general, it can be assumed that the changing outward solar wind pressure causes a dynamic boundary position. Since the solar wind plasm…
Ulysses solar wind plasma observations at high latitudes
McComas, D. J.; Goldstein, B. E.; Bame, S. J. +7 more
Ulysses reached its peak northerly heliolatitude of 80.2 degN on July 31st, 1995, and is now moving towards aphelion at 5.41 AU which it will reach in May, 1998. We summarize measurements from the solar wind plasma experiment, SWOOPS, emphasizing northern hemispheric observations but also providing southern and equatorial results for comparison. T…
Field-aligned particle streaming in the duskside high latitude Jovian magnetosphere
Krupp, N.; Woch, J.; Dougherty, M. K. +7 more
We report on observations of magnetic field and energetic particle data from the Ulysses spacecraft (S/C) inside the Jovian high latitude duskside magnetosphere. We have combined particle data from the EPAC and the HI-SCALE detectors and find evidence for bi-directional streaming of electrons along the magnetic field lines during the entire outbou…
Comet halley's nucleus: A physical interpretation
Keller, H. U.; Thomas, N.
The nucleus of comet Halley was the first to be detected and observed by cameras on board spacecraft during the fly-bys in 1986. The interpretation of both these observations and of the results from other experiments as well as many subsequent corroborative measurements of comet Halley and of other comets are reviewed. Cometary nuclei are relative…
Overview of the soho mission
Bonnet, R. M.; Felici, F.
The SOHO spacecraft was launched on 2 December 1995, some 8 years after it started to be developed by European industry. Since 14 February 1996, SOHO is in a halo orbit around the Lagrangian point L1. It is continuously in view of the Sun, allowing uninterrupted sequences of observations of our star, a first in the development of solar physics. It…
Acceleration and modulation of energetic particles in the 3-D heliosphere by corotating interaction regions
Simnett, G. M.; Roelef, E. C.
The passage of the Ulysses spacecraft over the poles of the Sun in 1994/1996 has given us a unique insight into the physics of the third dimension of the heliosphere. During the 30-month transit from Jupiter to the south polar pass, the low-latitude heliosphere was dominated by a high speed solar wind stream which produced a corotating interaction…
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…