Search Publications
The anomalous component of cosmic rays: Oxygen latitudinal gradient
Klecker, B.; Sanderson, T. R.; Marsden, R. G. +3 more
We have studied the latitudinal evolution of the anomalous cosmic ray oxygen component at ULYSSES during its journey to the south pole of the sun. Observations from the COSPIN Low Energy Telescope at ULYSSES are compared with observations in the vicinity of the Earth, provided by the HILT sensor on the SAMPEX spacecraft. We present results in two …
Sources of shocks and compressions in the high-latitude solar wind: Ulysses
Hoeksema, J. T.; McComas, D. J.; Goldstein, B. E. +3 more
During its southern transit Ulysses sampled the solar wind to -80.2° latitude. Slow streamer belt wind was seen only equatorward of -35°, but its influence extended to much higher latitudes. Reverse shocks bounding the equatorial CIR were seen as far south as -58.2°. High-latitude compressional waves showed no clear correlation with that CIR. Spee…
The Ulysses south polar pass: Anomalous component of cosmic rays
Klecker, B.; Bothmer, V.; Sanderson, T. R. +4 more
We have expanded our previous study of latitudinal gradients of anomalous cosmic ray oxygen (8 to 12 MeV/n and 12 to 16 MeV/n) by using also helium (11 to 20 MeV/n) as an additional component and a larger ULYSSES/LET data set including the segment up to the maximum southern latitude and the pole-to-equator segment of the mission down to 38°S. The …
Dual-frequency radio sounding of the solar corona during the 1995 conjunction of the Ulysses spacecraft
Pätzold, M.; Bird, M. K.; Asmar, S. W. +2 more
The Ulysses Solar Corona Experiment was performed during the spacecraft's superior solar conjunction from 22 February to 14 March 1995, shortly before perihelion and the transit through the ecliptic plane. The high inclination of the Ulysses orbit resulted in an unusual occultation geometry for coronal radio sounding with the spacecraft's dual-fre…
Anomalous cosmic ray oxygen and neon (∼2.4 MeV/nucl) at high southern heliolatitudes
Lanzerotti, L. J.; Maclennan, C. G.
We report measurements of the anomalous oxygen and neon as measured with the HI-SCALE instrument on Ulysses at high southern heliolatitudes. Using both energy spectral features and C/O ratios, 2.0-2.8 MeV/nucl anomalous O is not distinguishable below a latitude of ∼40°S. The heliolatitude gradient is found to be +0.06±0.50% / degree for the heliol…
Detection of a solar particle event at an heliolatitude of 73.8°S
Pick, M.; Forsyth, R. J.; Lanzerotti, L. J. +2 more
We report the observations of an electron event at a heliolatitude of 73.8°S, the highest latitude interplanetary solar event reported to date. This event was detectable because the interplanetary background was not obscured by electrons produced in co- rotating interaction regions. The event was associated with an interplanetary type III burst an…
Stream interfaces and energetic ions II: Ulysses test of Pioneer results
Gosling, John T.; Intriligator, Devrie S.; Kunow, Horst +2 more
Ulysses measurements of energetic and solar wind particles taken near 5 AU between 20 and 30 degrees south latitude during a well-developed recurring corotating interaction region (CIR) show that the CIR's corotating energetic ion population (CEIP) associated with the trailing reverse shock starts within the CIR at the stream interface. This is co…
Radial gradients of ion densities and temperatures derived from SWICS/Ulysses observations
Livi, S.; Woch, J.; Marsch, E. +4 more
Mean density and temperature gradients of solar wind protons and α particles are derived from SWICS/Ulysses observations between 1.2 and 5.4 AU in the ecliptic plane during declining solar activity. All parameters are sorted in solar wind speed classes. The radial gradients show a similar behavior for both ion species. In the slow solar wind proto…
Cosmic ray modulation by expanding, high-latitude streams
Keppler, E.; Quenby, J. J.; Drolias, B. +2 more
As ‘Ulysses’ moved to latitudes above 45°, the regular, recurring series of mid-latitude high-speed streams is no longer observed out to 4 AU. However, the associated, near-relativistic particle modulation persists to at least 70°. We explain this remote shadowing as due to the spread in latitude of the fast streams beyond the ‘Ulysses’ trajectory…
The propagation of sub-MeV solar electrons to heliolatitudes above 50°S
Simnett, G. M.; Pick, M.; Kerdraon, A. +5 more
On 27 February 1994 when the Ulysses spacecraft was at an heliolatitude of 54°S low energy electrons (∼50-400 keV) and high energy protons (14-31 MeV) were measured following a solar flare beyond the west limb. These measurements show that under favorable conditions energetic particles can be transported very rapidly across 60 degrees in heliocent…