LESIA, Observatoire de Paris, CNRS, UPMC, Universite Paris Diderot, 5 Place Jules Janssen, Meudon, 92190, France
Dip. Fisica and CNISM, Università di Pisa, Largo Pontecorvo n.3, Pisa, 56100, Italy
LESIA, Observatoire de Paris, CNRS, UPMC, Universite Paris Diderot, 5 Place Jules Janssen, Meudon, 92190, France
Dip. Fisica and CNISM, Università di Pisa, Largo Pontecorvo n.3, Pisa, 56100, Italy; LESIA, Observatoire de Paris, CNRS, UPMC, Universite Paris Diderot, 5 Place Jules Janssen, Meudon, 92190, France
Space Sciences Lab and Department of Physics, University of California, Berkeley, Berkeley, CA 94720, USA
School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455, USA
NASA Goddard Space Flight Center, Code 674, Greenbelt, MD 20771, USA