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A review of discontinuities and Alfvén waves in interplanetary space: Ulysses results

Tsurutani, Bruce T.; Ho, Christian M.

The Ulysses mission is the first to explore our heliosphere at all latitudes up to +/-80° and therefore is an ideal mission to study potential gradients in heliolatitude (and radial distance) of discontinuity occurrence rates and types. Directional discontinuities (DDs) are shown to be dependent on the type of solar wind streams that they are embe…

The three-dimensional solar wind at solar activity minimum

Neugebauer, M.

In early 1998 the Ulysses spacecraft made history by completing an orbit around the Sun inclined to the solar equator by 80°. It observed the properties of the high-latitude heliosphere at a time of low solar activity when the configuration of the solar magnetic field was relatively simple. The solar wind data acquired by Ulysses have placed firm …