Alfvén Laboratory, Royal Institute of Technology, Stockholm, SE-10044 Sweden
Alfvén Laboratory, Royal Institute of Technology, Stockholm, SE-10044 Sweden; University of Texas at Dallas, Center for Space Sciences, PO box 830688 MS/FO 22, Richardson, TX 75083-0688, USA
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Vorob'evy Gory, Moscow, 119992 Russian Federation
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Vorob'evy Gory, Moscow, 119992 Russian Federation
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Vorob'evy Gory, Moscow, 119992 Russian Federation
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Vorob'evy Gory, Moscow, 119992 Russian Federation