[1] SW Res Inst, San Antonio, TX USA
[2] Univ Colorado, Boulder, CO 80309 USA
[3] Univ Toulouse 3, CNRS, IRAP, F-31062 Toulouse 4, France
[4] Univ Colorado, LASP, Boulder, CO 80309 USA
[5] Katholieke Univ Leuven, Ctr Math Plasma Astrophys, Leuven, Belgium
[6] Univ Southampton, Dept Phys & Astron, Southampton, Hants, England
[7] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA
[8] Max Planck Inst Sonnensyst Forsch, Gottingen, Germany
[9] INAF, Inst Space Astrophys & Planetol, Rome, Italy
[10] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA