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Published online by Cambridge University Press: 17 November 2003
The Hanle effect was first used in solar physics to determine weakmagnetic fields in prominences (see Leroy 1981). More recently the development of a new generation of very accuratespectro-polarimeters has open a new window for the diagnostics of weak magnetic fields inthe solar photosphere and chromosphere, based on the Hanle effect. I present here such recent research programs performed with the solar telescope THEMIS and with other polarimeters such as ZIMPOL and the LOCARNO polarimeter.