tokens: We are indebted to Brian Marsden, who performed the orbit calculations that made these observations possible. S.G. and J.C.R. thank the International Space Science Institute (Bern, Switzerland) for the opportunity to discuss this work within the International Study Team program. SOHO is a project of international cooperation between ESA and NASA. UVCS is a joint project of NASA, Italian Space Agency (ASI), and the Swiss Funding Agencies. LASCO was built by a consortium of the Naval Research Laboratory, USA; the Laboratoire d'Astrophysique de Marseille (formerly Laboratoire d'Astronomie Spatiale), France; the Max-Planck-Institut für Sonnensystemforschung (formerly Max Planck Institute für Aeronomie), Germany; and the School of Physics and Astronomy, University of Birmingham, UK. This work was supported by NASA grant NAG5-12814. Facility: SOHO (UVCS, LASCO)
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