Los Alamos National Laboratory, P.O. Box 1663, MS D466, Los Alamos, NM 87545, USA
Los Alamos National Laboratory, P.O. Box 1663, MS D466, Los Alamos, NM 87545, USA
Los Alamos National Laboratory, P.O. Box 1663, MS D466, Los Alamos, NM 87545, USA
Los Alamos National Laboratory, P.O. Box 1663, MS D466, Los Alamos, NM 87545, USA
Los Alamos National Laboratory, P.O. Box 1663, MS D466, Los Alamos, NM 87545, USA
Rutherford Appleton Laboratory, Space Sciences Division, Oxford, OX11 OQX United Kingdom; Imperial College of Science, Technology and Medicine, Prince Consort Road, London, SW7 2BW United Kingdom
Centre of Space Physics, Boston University, Boston, MA 02215, USA
Max-Planck-Institut für Aeronomie, Max-Planck-Str.2, Katlenburg-Lindau, 37191 Germany
Imperial College of Science, Technology and Medicine, Prince Consort Road, London, SW7 2BW United Kingdom