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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…