Affiliation: | (1) Jet Propulsion Laboratory, 169-327, California Institute of Technology, 4800 Oak Grove Drive, 91109 Pasadena, CA, USA;(2) Space Radiation Laboratory, 220-47, California Institute of Technology, 91125 Pasadena, CA, USA;(3) Service d'Astrophysique, DAPNIA, CE Saclay, 91191 Gif sur Yvette Cedex, France;(4) University of Helsinki, Observatory, Box 14, FIN-00014, Finland |