Search Publications
High Energy Cosmic Ray Nuclei Results on Ulysses: 1. Mission Overview
Sierks, H.; Kunow, H.; Wibberenz, G. +9 more
The cosmic ray flux observed with the Kiel Electron Telescope on board the ULYSSES spaceprobe varies with solar activity as well as with heliospheric position. Determination of the latitudinal gradients requires a careful analysis of the influences of the current sheet tilt angle, the number of major solar flares, interplanetary shocks and interac…
The High Latitude Heliospheric Magnetic Field
Forsyth, R. J.
As the Ulysses spacecraft approaches its first pass under the south pole of the sun, it is an appropriate time to review our current knowledge and predictions regarding the three dimensional behaviour of the heliospheric magnetic field, in particular at high heliographic latitudes. Optical techniques for measuring the photospheric magnetic field a…
Reconnection on Open Field Lines Ahead of Coronal Mass Ejections
McComas, D. J.; Forsyth, R. J.; Phillips, J. L. +3 more
Plasma and magnetic field signatures from 29 November 1990 indicate that the Ulysses spacecraft passed through a series of interplanetary structures that were most likely formed by magnetic reconnection on open field lines ahead of a coronal mass ejection (CME). This reconnection changed the magnetic topology of the upstream region by converting n…
ULYSSES Observations of Solar Wind Plasma Parameters in the Ecliptic From 1.4 to 5.4 AU and Out of the Ecliptic
Balogh, A.; McComas, D. J.; Goldstein, B. E. +4 more
We report observations of radial and latitudinal gradients of Ulysses plasma parameters. The solar wind velocity increased rapidly with latitude from 0° to 35°, then remained approximately constant at higher latitudes. Solar wind density decreased rapidly from 0° to 35° of latitude, and also was approximately constant beyond that latitude. The mas…
Motion of the Heliospheric Termination Shock at High Heliographic Latitude
Barnes, Aaron
We expect the mean distance of the heliospheric termination shock to be greater (smaller) at polar latitudes than at equatorial latitudes, depending on whether the mean dynamic pressure of the solar wind is greater or smaller at high latitudes. The heliospheric termination shock is expected to move in response to variation in upstream solar wind c…
Latitudinal Variations in the Solar Wind Electron Heat Flux
Scime, Earl E.; Bame, Samuel J.; Phillips, John L. +1 more
Ulysses measurements of the solar wind electron heat flux as a function of heliographic latitude are presented. The latitudinal in the electron heat flux presented have been normalized by the radial gradient in the electron heat flux obtained during the in-ecliptic phase of the Ulysses mission (qe∼ R-3.0). We find no signific…
Energetic Particle Observations at High Heliographic Latitudes
Krupp, N.; Fränz, M.; Balogh, A. +7 more
Energetic particles, accelerated in shocks which were associated with recurrent fast solar wind streams, were observed in high heliographic latitudes; fifteen such steams were included in the present study. Intensity variations ranged up to four orders of magnitude. Energy spectra were typically steeper near forward shocks than near reverse shocks…
Fourier Parameters of Heliospheric Current Sheet and Their Significance
Schulz, Michael
If the path of the neutral line on the coronal source surface is expressible as a singlevalued function (colatitude θ vs longitude φ), then Fourier analysis of ctn θ with respect to φ leads to a simple algorithm for realistically mapping the neutral line outward to model the heliospheric current sheet (HCS) at distancesr≳1 AU. To be compatible wit…
Ulysses observations of a coronal origin particle event at 32° south heliographic latitutde
Simnett, G. M.; Pick, M.; Kerdraon, A. +6 more
A remarkable streaming beam-like particle event of 60 keV-5 MeV ions and of 38 315 keV electrons has been reported previously. This event has been associated with the passage of a Coronal Mass Ejection (CME) over the Ulysses spacecraft on June 9 13, 1993. At this time, the spacecraft was located at 4.6 AU from the sun and at an heliolatitude of 32…
Elemental Abundances in Corotating Interaction Regions at High Solar Latitudes
Lanzerotti, L. J.; Maclennan, C. G.
Throughout 1993, as the Ulysses spacecraft traveled from ∼23° to ∼45° south heliolatitude, the HI-SCALE instrument on the spacecraft measured a recurrent series of enhanced particle fluxes with a recurrence period of ∼26.5 days. These particles are accelerated from a background seed population by the corotating interaction regions (CIRs) associate…