Alfvén Laboratory, Royal Institute of Technology, School of Electrical Engineering, Stockholm, SE-10044 Sweden
Alfvén Laboratory, Royal Institute of Technology, School of Electrical Engineering, Stockholm, SE-10044 Sweden; University of Texas at Dallas, Center for Space Sciences, PO Box 830688, FO22, Richardson, TX 75083, USA
Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119992 Russian Federation
Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119992 Russian Federation
Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119992 Russian Federation
Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119992 Russian Federation