Results 111 to 120 of about 6,743 (215)
Exploring geomagnetic variations in ancient mesopotamia: Archaeomagnetic study of inscribed bricks from the 3rd-1st millennia BCE. [PDF]
Proc Natl Acad Sci U S A, 2023 Howland MD +5 more
europepmc +1 more source
Determination of a steady velocity field in a rotating frame of reference at the surface of the Earth's core [PDF]
, 1996 Backus +44 more
core +1 more source
Solar generated quasi-biennial geomagnetic variation [PDF]
The existence of highly correlated quasi-biennial variations in the geomagnetic field and in solar activity is demonstrated. The analysis uses a numerical filter technique applied to monthly averages of the geomagnetic horizontal component and of the ...
Poros, D. J., Sugiura, M.
core +1 more source
Ibn Al-Haitham Journal for Pure and Applied Sciences, 2017 ln this paper we study and analysis the total intensity (P) .and the horizontal component (H) of the geomagnetic field at the location na ly Brazilian Anomaly (Lat 25S, long 4S·"W) in which the geomagnetic field intensity has a ...
H.A. AI-Mahdi, A.F. Mokheber
doaj
Steady induction effects in geomagnetism. Part 1B: Geomagnetic estimation of steady surficial core motions: A non-linear inverse problem [PDF]
The problem of estimating a steady fluid velocity field near the top of Earth's core which induces the secular variation (SV) indicated by models of the observed geomagnetic field is examined in the source-free mantle/frozen-flux core (SFI/VFFC ...
Voorhies, Coerte V.
core +1 more source
Report of the panel on earth structure and dynamics, section 6 [PDF]
The panel identified problems related to the dynamics of the core and mantle that should be addressed by NASA programs. They include investigating the geodynamo based on observations of the Earth's magnetic field, determining the rheology of the mantle ...
Dziewonski, Adam M. +4 more
core +1 more source
How do core surface flow models vary when inverted from IGRF-14 candidate field models? [PDF]
Earth Planets SpaceRogers HF, Mandea M.
europepmc +2 more sources
Meyer, et al. have improved their original global crustal model and made a spherical harmonic analysis of the resulting magnetic field to n=50. The Z contours at 400 Km altitude from a field model composed of the first 15 degrees and order of their model
Cain, J. C.
core +1 more source
Geomagnetic modeling by optimal recursive filtering [PDF]
The results of a preliminary study to determine the feasibility of using Kalman filter techniques for geomagnetic field modeling are given. Specifically, five separate field models were computed using observatory annual means, satellite, survey and ...
Estes, R. H., Gibbs, B. P.
core +1 more source
The scientific case for magnetic field satellites [PDF]
To make full use of modern magnetic data and the paleomagnetic record, we must greatly improve our understanding of how the geodynamo system works. It is clearly nonlinear, probably chaotic, and its dimensionless parameters cannot yet be reproduced on a ...
Backus, George E. +3 more
core +1 more source