Affiliation: | 1.Max-Planck-Institut für Sonnensystemforschung, 37191, Katlenburg-Lindau, Germany ;2.Institute of Experimental Physics, Slovak Academy of Sciences, 04001, Ko?ice, Slovakia ;3.Universit?t Kiel, 24118, Kiel, Germany ;4.Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, 20723, USA ; |