H.K. was supported by the Japanese Society for the Promotion of Science. The work of C.T.R. was supported by the National Aeronautics and Space Administration under grant NAGW-3948. H.E.S. was supported by a subcontract under NASA contract NAS5-30368. The research of G.R. was supported by the Natural Science and Engineering Research Council of Canada. We acknowledge the MIF-M magnetometer team of the ASPI experiment on board INTERBALL-1, in particular S. Klimov, S. Romanov, P. Petrukovich, and S. Savin, for their data. The CANOPUS instrument array was constructed and is maintained and operated by the Canadian Space Agency for the Canadian scientific community. We acknowledge the Geological Survey of Canada for their data. We also acknowledge the STEP Polar Network team at the University of Tokyo, in particular K. Hayashi and H. Matsui, for their data.