*Allison Craddock¹、John Labrecque²、John Rundle³、Basara Miyahara⁴ (1.NASA Jet Propulsion Laboratory, California Institute of Technology, USA、2.University of Texas, Center for Space Research, USA、3.University of California, Departments of Physics and Earth & Planetary Science, USA、4.Geospatial Information Authority of Japan, Japan)