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Latitudinal transport of 7 MeV Jovian and galactic electrons in the inner heliosphere
Fichtner, H.; Ferreira, S. E. S.; Potgieter, M. S. +2 more
The heliospheric modulation of galactic and Jovian electrons is studied using a fully three-dimensional, steady-state model based on Parker's transport equation including the Jovian source. The model is used to study the latitudinal transport of both 7 MeV Jovian and galactic electrons by illustrating how the electron intensities are affected at d…
Coherence of Charged Particle Oscillations in the Heliosphere (f∼5 µHz): Implications for a Solar Modulation Source
Kunow, H.; Lanzerotti, L. J.; Maclennan, C. G. +3 more
Time series analysis of low energy electron and high energy proton cosmic ray fluxes, both measured on the Ulysses spacecraft, shows that they are coherent in some frequency bands in the energy range 0-6 µHz, especially near 5 µHz. Interplanetary particle fluxes with very different kinematic properties (e.g., gyrofrequencies) are modulated coheren…
Solar cycle variations of GCR anisotropies at Ulysses
Fraenz, M.; Heber, B.; Blake, J. B. +1 more
The four telescope array of the EPAC investigation aboard Ulysses provides a good measurement of the anisotropy of the > 230 MeV GCR ux during those frequent time periods when MeV solar electrons are not present. We focused on the time period since late 1994 and found that the angular distribution of the GCR, as determined by the ratio of count…
Cosmic Ray Elemental Source Composition: Observations with the Ulysses High Energy Telescope
Connell, J. J.; Burin de Roziers, E.
We will present new and revised measurements of cosmic ray source abundances from boron to nickel. The High Energy Telescope (HET) on the Ulysses spacecraft provides high resolution measurements of cosmic rays, separating elements from hydrogen to nickel for energies ranging from 40 to 400 MeV/u. We determine cosmic ray source abundances by compar…
Small scale structures of the heliospheric magnetic field and the propagation of cosmic rays
Balogh, A.; Nemeth, Z.; Erdos, G.
The heliospheric magnetic field is rich in highly fragmented small-scale structures. The magnetic background strongly influences the motion of the charged particles of relatively low rigidity. Using high time resolution magnetic field data measured by the magnetometer onboard Ulysses, we study the small-scale magnetic structures, including fractal…
Recurrent Cosmic Ray Decreases During the Second Ulysses orbit. COSPIN/KET results.
Kunow, H.; Heber, B.; Ferrando, P. +5 more
The recurrent cosmic ray decreases, their evolution with heliolatitude, the rigidity dependence of their amplitude and their relation with the Corotating Interaction Regions have been extensively studied during the first Ulysses orbit. These studies are mainly concentrated in south heliographic latitudes under conditions close to Solar minimum. In…
Solar energetic proton intensity profiles at 5 AU from the Sun
Balogh, A.; Heber, B.; McKibben, R. B. +2 more
We compare Ulysses particle measurements for two large gradual solar energetic particle (SEP) events, which took place on 24 August 1998 and 20 January 1999. At these times the Ulysses spacecraft was close to the ecliptic plane and at ∼5.2 AU from the Sun. The two events are characterised by similar time intensity profiles for 40-100 MeV protons, …
Ulysses observations of solar energetic particles to high heliographic latitudes
Giacalone, J.; McKibben, R. B.; Zhang, M. +3 more
At the time of the flare on the Bastille Day of 2000, Ulysses spacecraft was at 3.17 AU from the sun, high heliographic latitude of 62° South, and 116° in longitude east of the Earth. The event produced large fluxes of energetic particles up to energies >100 MeV at both Ulysses and the Earth. Enhancements of energetic particles were immediately…
The Major Discoveries of the ULYSSES Mission
Fisk, L. A.
The Galactic Cosmic Ray 36Cl Clock: ULYSSES HET Results
Simpson, J. A.; Du Vernois, M. A.; Connell, J.