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These observations consisted of three different categories: (1) radio telescope tracking of the Huygens signal at 2040 MHz, (2) observations of the atmosphere and surface of Titan, and (3) attempts to observe radiation emitted during the Huygens Probe entry into Titan's atmosphere. The Probe radio signal was successfully acquired by a network of terrestrial telescopes, recovering a vertical profile of wind speed in Titan's atmosphere from 140 km altitude down to the surface. Ground\u2010based observations brought new information on atmosphere and surface properties of the largest Saturnian moon. No positive detection of phenomena associated with the Probe entry was reported. This paper reviews all these measurements and highlights the achieved results. The ground\u2010based observations, both radio and optical, are of fundamental importance for the interpretation of results from the Huygens mission.<\/jats:p>","DOI":"10.1029\/2005je002640","type":"journal-article","created":{"date-parts":[[2006,7,26]],"date-time":"2006-07-26T20:26:16Z","timestamp":1153945576000},"source":"Crossref","is-referenced-by-count":30,"title":["Overview of the coordinated ground\u2010based observations of Titan during the Huygens mission"],"prefix":"10.1029","volume":"111","author":[{"given":"Olivier","family":"Witasse","sequence":"first","affiliation":[{"name":"Research and Scientific Support Department ESA, ESTEC  Noordwijk Netherlands"}]},{"given":"Jean\u2010Pierre","family":"Lebreton","sequence":"additional","affiliation":[{"name":"Research and Scientific Support Department ESA, ESTEC  Noordwijk Netherlands"}]},{"given":"Michael K.","family":"Bird","sequence":"additional","affiliation":[{"name":"Radioastronomisches Institut Universit\u00e4t Bonn  Bonn 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