*Paul Prikryl^1,2、James M. Weygand³、Reza Ghoddousi-Fard⁴、Bharat S. R. Kunduri⁵、P. T. Jayachandran¹、Knut S. Jacobsen⁶、Yngvild L. Andalsvik⁶、Tibor Durgonics⁷、Kjerrmar Oksavik^8,9 (1.Physics Department University of New Brunswick, Canada、2. Geomagnetic Laboratory Natural Resources Canada、3.Earth Planetary and Space Sciences, University of California, USA、4.Canadian Geodetic Survey Natural Resources Canada 、5.Bradley Dept. of Electrical and Computer Engineering, Virginia Tech, USA、6.Norwegian Mapping Authority, Norway、7.National Space Institute, Technical University of Denmark, Denmark、8.Department of Physics and Technology, University of Bergen, Norway、9.Arctic Geophysics, University Centre in Svalbard, Norway)