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Modelling cosmic ray intensities along the Ulysses trajectory

Ferreira, S. E. S.; Potgieter, M. S.; Heber, B. +1 more

Time dependent cosmic ray modulation in the inner heliosphere is studied by comparing results from a 2-D, time-dependent cosmic ray transport model with Ulysses observations. A compound approach, which combines the effects of the global changes in the heliospheric magnetic field magnitude with drifts to establish a realistic time-dependence, in th…

Large-scale velocity fluctuations in polar solar wind

Bavassano, B.; Bruno, R.; D'Amicis, R.

The 3-D structure of the solar wind varies dramatically along the Sun's activity cycle. In the present paper we focus on some properties of the polar solar wind. This is a fast, teneous, and steady flow (as compared to low-latitude conditions) that fills the high-latitude heliosphere at low solar activity. The polar wind has been extensively inves…

Shock parameter calculations at weak interplanetary shock waves

Balogh, A.; Gloag, J. M.

A large set of interplanetary shock waves observed using the Ulysses spacecraft is analysed in order to determine their local parameters. For the first time a detailed analysis is extended to the thermodynamic properties of a large number of events. The intention is to relate the shock parameters to the requirements set by MHD shock theory. A unif…