Presents the results on the Sun which were given by the space missions Yohkoh, Soho and Trace. This volume covers subjects such as deep solar interior, extended corona, and the diagnostic and the physical interpretation of the spectacular phenomena represented by solar activity.

The space missions Yohkoh, Soho and Trace, together with complementary ground-based instrumentation, have in recent years given us a wealth of new results on the Sun, which are not readily available or digestible for the non-specialist. They are presented here in an organised, tutorial fashion by leading astrophysicists who gathered to observe the total eclipse of 11 August 1999 in Bucharest. The subjects covered range from the deep solar interior to the extended corona, with an emphasis on the diagnostic and on the physical interpretation of the spectacular phenomena represented by solar activity. It is intended for graduate students. Senior scientists will appreciate the comprehensive update of solar physics. Amateur astronomers having an adequate knowledge of physics will also enjoy the book.

Preface. Group photograph. List of participants. Eclipses from the standpoint of celestial mechanics
M. Stavinschi. The Williams College expedition to Ramnicu Valcea
J.M. Pasachoff. Heliospheric extent of the coronal phenomena
G. Maris. The solar corona: white light polarization and modelling of the large scale electron density distribution
P. Cugnon, J.-R. Gabryl. Observing the solar magnetic field
I.S. Kim. Solar activity
Z. Mouradian. New views of active regions, flares and CME's from space
Y. Uchida. Modeling the evolution of solar magnetic fields
K. Galsgaard. Non-LTE radiation processes: Application to the Solar Corona
S. Collin. Models of the solar atmosphere
P. Heinzel. Inversion of line profiles and solar fine structures
P. Mein. Sounding the solar interior
W.A. Dziembowski. What we know about the solar interior
J.-P. Zahn. Theory of solar luminosity variations
H.C. Spruit. Index.