Includes bibliographical references.
|Statement||by Steven M. Shope.|
|Series||Bureau of Mines report of investigations ;, 8781, Report of investigations (United States. Bureau of Mines) ;, 8781.|
|LC Classifications||TN23 .U43 no. 8781, TN297 .U43 no. 8781|
|The Physical Object|
|Pagination||14 p. :|
|Number of Pages||14|
|LC Control Number||82600362|
The earth is represented by a homogeneous half-space model in which a dipole source is immersed. The vertical magnetic field equipotential contours at and above the surface are graphically mapped. The volumes of the regions bounded by these contours are directly related to the geometrical zones of . Above-the-earth field contours for a dipole buried in a homgeneous half-space. [Avondale, Md.]: U.S. Dept. of the Interior, Bureau of Mines, (OCoLC) Material Type: Government publication, National government publication, Internet resource: Document Type: Book, Internet Resource: All Authors / Contributors: S M Shope. Above-the-earth field contours for a dipole buried in a homgeneous half-space / By Steven M. Shope. Abstract. Includes bibliographical of access: Internet Topics: Magnetic dipoles., Electromagnetic fields., Mine communication. This tool shows you a surface map of the total field anomaly, B t, after you specify the inclination, declination, and strength of the inducing field, the depth of the buried dipole, and the strength of the buried dipole's magnetic moment, m (which is proportional to its magnetic susceptibility and the inducing field .
Earth’s Magnetic Field Magnetic Potential for a dipole field pointing South V(r) = m • r / (4 π r3) = − m cosθ / (4 π r2) = scalar magnetic potential of dipole field. Field is expanded in spherical harmonics. First term (above) is the dipole term. m = 8 x Am2 is dipole moment at center of Earth point south r = distance from dipole. Non-dipole Field Catherine Constable Ð3 C rustal C ontribution dom inates beyond l= 15 C ore field dom inates (a) (b) Figur e 2: The spatial po wer spectrum of the geomagnetic Þeld (a) and the spatial po wer spectrum of the secular variation (b) evaluated at EarthÕ s surf ace (r = km). In (a) black dots are for a satellite Þeld. is a platform for academics to share research papers. The geomagnetic poles are the poles of the dipole field. In the geomagnetic poles the axis of the approximated dipole field cuts the earth surface. First the dipole axis, so the geomagnetic poles, should be looked here. In older physics books you find often following values for the dipole axis (state in ).
Abstract In some recent publications, King (, ) and King and Sandler () have provided formulas for the electromagnetic field radiated by an infinitesimal vertical Hertzian dipole above. In contrast, the magnetic field in the free-space exterior region, r > a is the sum of the incident field and that of an ideal magnetic dipole centered at the origin with magnetic moment, m S. Above-the-earth field contours for a dipole buried in a homgeneous half-space. Personal Author: Shope, S. M. (Steven M.) Corporate Authors: United States. Bureau of Mines. Published Date: Series: Report of investigations (United States. Bureau of Mines) ; Magnetic induction in the Earth's crust is of scientific interest beyond space weather. It is a powerful tool for scientists studying the interior of the Earth. By measuring the natural variations of the geomagnetic and geoelectric fields (a technique known as magneto-telluric (MT) surveying (Simpson and Bahr, )), they can infer information about the conductivity of subsurface layers and.