The author thanks P. Testa, S. Orlando, G. Peres, J. Klimchuk, and the anonymous referees for suggestions. The author acknowledges support from the Italian Ministero dell’Università e della Ricerca. The Transition Region and Coronal Explorer (TRACE) is a mission of the Stanford-Lockheed Institute for Space Research, and part of the NASA Small Explorers program. The solar X-ray images of Figure 2* is from the Yohkoh mission of ISAS, Japan. The X-ray Telescope was prepared by the Lockheed-Martin Solar and Astrophysics Laboratory, the National Astronomical Observatory of Japan, and the University of Tokyo with the support of NASA and ISAS. SDO is the first mission launched for NASA’s Living With a Star program.

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