Abstract

The October 6, 1990, launch of the joint European Space Agency (ESA)‐NASA Ulysses mission marked the start of a new era in the study of the heliosphere. For the first time since the dawn of the space age, in situ observations of heliospheric fields and particles are being made in the Sun's polar regions and over the full range of heliographic latitudes.Since shortly after launch, Ulysses has returned an unprecendented data set with which to study the properties of the solar wind, the heliospheric magnetic field, locally accelerated and solar energetic particles, and cosmic rays, as well as important interstellar constituents, dust, and neutral helium. The spacecraft also carries instrumentation to detect solar X rays and cosmic gamma rays, and a radio science investigation to probe the solar corona.

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