Aeromagnetic surveys in the seas around Japan in 1980 |
| |
| Authors: | S Utashiro S Oshima T Kaneko |
| |
| Institution: | (1) Department of Physics, Science University of Tokyo, Tokyo, Japan;(2) Hydrographic Department, M.S.A., Tokyo, Japan |
| |
| Abstract: | Aeromagnetic surveys in the seas around Japan were carried out in 1979 to 1980 by a YS-11 aircraft of the Maritime Safety Agency of Japan using a new type of airborne magnetometer system. The new type of airborne magnetometer system consists of a ring-core type three-component fluxgate magnetometer, an inertial sensing system, a fish-eye camera to measure the true north, an 8-bit microcomputer and a proton magnetometer. The VLF/OMEGA system is used to fix the position of the aircraft. Tracks extended to about 600 nautical miles off the coast of the Japanese islands in the Sea of Japan and the North-West Pacific Ocean. Average spacing between tracks was about 80 miles. The flights were carried out at an altitude of 9500 feet. From the survey results, magnetic charts of the seven geomagnetic elements for 1980 over the sea around Japan were compiled by the method of least squares using a polynomial. Also, the contour charts of secular variation in 1980 were compiled. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
