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Geomagnetic Observations for Main Field Studies: From Ground to Space
2010
Direct measurements of the geomagnetic field have been made for more than 400 years, beginning with individual determinations of the angle between geographic and magnetic North. This was followed by the start of continuous time series of full vector measurements at geomagnetic observatories and the beginning of geomagnetic repeat stations surveys in the 19th century. In the second half of the 20th century, true global coverage with geomagnetic field measurements was accomplished by magnetometer payloads on low-Earth-orbiting satellites. This article describes the procedures and instruments for magnetic field measurements on ground and in space and covers geomagnetic observatories, repeat stations, automatic observatories, satellites and historic observations. Special emphasis is laid on the global network of geomagnetic observatories.
Journal of Earth System Science, 1990
The magnetic method is the oldest and one of the most widely used geophysical techniques for exploring the earth’s subsurface. It is a relatively easy and inexpensive tool to employ, being applicable to a wide variety of subsurface exploration problems involving horizontal magnetic property variations occurring from near the base of the crust to within the uppermost meter of soil.
(a) General, In Canada and some other countries, governments agencies have surveyed much of the country and aeromagnetic maps on a scale of 1 mile to the inch are available at a nominal sum. Large areas in all parts of the world have also been surveyed in the course of oil and mineral exploration. The sensitivity of airborne magnetometers is generally greater than those used in ground exploration -about 0.01 nT compared with 10 to 20 nT. Because of the initial large cost of the aircraft and availability of space, it is practical to use more sophisticated equipment than could be handled in portable instruments; their greater sensitivity is useful in making measurements several hundred meters above the ground surface, whereas the same sensitivity is usually unnecessary (and may even be undesirable) in ground surveys.
Magnetic airborne survey – geophysical flight
Geoscientific Instrumentation, Methods and Data Systems, 2016
This paper provides a technical review process in the area of airborne acquisition of geophysical data, with emphasis for magnetometry. In summary, it addresses the calibration processes of geophysical equipment as well as the aircraft to minimize possible errors in measurements. The corrections used in data processing and filtering are demonstrated with the same results as well as the evolution of these techniques in Brazil and worldwide.
Geomagnetic investigation of mineral rocks at
2016
Copyright © 2014 OJO, Akintayo O, POPOOLA, O. I. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.