Search Publications

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 …

Solar cycle variation in the heliosphere

Gazis, P. R.

Variations in interplanetary plasma and magnetic field parameters over the course of a solar cycle affect a broad range of physical phenomena, such as planetary magnetospheres, cosmic ray modulation, and the interaction of the solar wind with the local interstellar medium. For more than 3 decades a succession of spacecraft have provided in situ me…

Solar wind corotating interaction regions: The third dimension

Gosling, J. T.

A new dimension has recently been added to our understanding of solar wind structure - the dimension out of the solar equatorial plane. Measurements made by the Ulysses space probe at high heliographic latitudes and powerful new 3-dimensional numerical simulations have revealed that solar wind corotating interaction regions (CIRs) tend to be tilte…

Charting the heliosphere in three dimensions

Neugebauer, M.

Space physicists continue their exploration of the solar system's home in the galaxy—that bubble of space, called the heliosphere, carved out of the interstellar medium by the solar wind. Studies of the heliospheric plasma are driven by the search for answers to questions such as: What mechanisms are responsible for the acceleration of the solar w…