Affiliation: | 1. Mullard Space Science Laboratory, University College London, Holmbury St Mary, UK 2. University of Birmingham, Birmingham, UK 3. National Solar Observatory, Tucson, AZ, USA 4. Institut d’Astrophysique Spatiale, Université Paris-Sud/C.N.R.S., 91405, Orsay Cedex, France 5. Konkoly Observatory of Hungarian Academy of Sciences, Budapest, Hungary 6. Observatoire de Paris, LESIA, FRE 2461(CNRS), 92195, Meudon Principal Cedex, France
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