A Topical Collection in Space Science Reviews will be published after the workshop. Furthermore the papers will be reprinted as a hardcover book in the Space Sciences Series of ISSI by the Springer Verlag (see www.issibern.ch/publications/sssi.html). We expect that papers will be due about 3 to 6 months after the workshop so they can reflect the discussions during the workshop. This volume is NOT intended to be the proceedings of the Workshop, but a collection of in-depth papers inspired by contributions and discussions at the Workshop. All papers will be peer reviewed, and the volume is expected to appear about 12 months after the workshop.