Results 111 to 120 of about 40,516 (259)

Polynomial Modelling of Southern African Secular Variation Observations Since 2005

Data Science Journal, 2011
The COMPASS (COmprehensive Magnetic Processes under the African Southern Sub-continent) program forms part of a collaboration project between Germany and South Africa, called Inkaba ye Africa, and aims to investigate the regional geomagnetic field in ...
P Kotzé, M Korte, M Mandea
doaj   +1 more source

The model of the geomagnetic non-dipole field.

Journal of geomagnetism and geoelectricity, 1983
Yukutake's model separates the geomagnetic field into drifting and standing parts, not only fits well to the observed field for the past several hundred years, but also emphasizig the regularities of the westward drift of the geomagnetic non-dipole field. However, there are still some problems to be reinvestigated:a) In Yukutake's model the geomagnetic
Tan-Wen WANG, Gui-Zhong QI
openaire   +2 more sources

Relative Contributions of Lower‐Atmosphere Tidal and Solar‐Magnetospheric Forcings to the Day‐to‐Day Variability of F‐Region Electron Density

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract We use Thermosphere Ionosphere Electrodynamics General Circulation Model simulations nudged to realistic tides and their statistical day‐to‐day variabilities (DTDVs), derived from Michelson Interferometer for Global High‐Resolution Thermospheric Imaging/Ionospheric Connection Explorer observations, to estimate the relative importance of tidal ...
Xian Lu, Jens Oberheide, Deepali Aggarwal   +2 more
wiley   +1 more source

Research on geomagnetic secular variation of China and surrounding areas based on the Geomagnetic Virtual Observatories

Earth and Planetary Physics
The Low Earth Orbit (LEO) geomagnetic satellites provide a large number of high-precision measurements, which are crucial for researching the Secular Variation (SV) of the geomagnetic field.
Jiang Li, Bin Chen
doaj   +1 more source

Error enhancement in geomagnetic models derived from scalar data [PDF]

Models of the main geomagnetic field are generally represented by a scalar potential gamma expanded in a finite number of spherical harmonics. Very accurate observations of F were used, but indications exist that the accuracy of models derived from them ...
Bredekamp, J. H., Stern, D. P.
core   +1 more source

Detection of Equatorial Plasma Bubbles Using the COSMIC‐2 Rate of TEC Index

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract Equatorial plasma bubbles (EPBs) are large‐scale plasma depletion structures that can disrupt Global Navigation Satellite Systems (GNSS) and other space‐based technologies. Several instruments have been employed to study EPB dynamics, with Total Electron Content (TEC) and Rate of TEC change Index (ROTI) data standing out as valuable parameters
Ana L. Christovam, Fabricio S. Prol, Marcio T. A. H. Muella   +2 more
wiley   +1 more source

Effect of Field Line Torsion on the Polarization of ULF Waves

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract In this paper we suggest a simple modification of the dipole magnetic field which introduces field‐aligned currents and torsion to the field lines. The resulting field lines are not contained in the meridional planes and have resemblance to the geomagnetic field lines in the dawn and dusk flanks of the magnetosphere. We analyze polarization of
K. Kabin, A. W. Degeling, R. Rankin
wiley   +1 more source

Geomagnetic Main-Field Modelling with POGS Satellite Data

Journal of geomagnetism and geoelectricity, 1997
Models of the geomagnetic main field of degree and order 13 are constructed for epoch 1992.5. These are based on combinations of (quiet-time, low activity) Polar Orbiting Geomagnetic Survey (POGS) total intensity data, and various near-surface, largely vector, measurements.
A. W. P. Thomson, S. Macmillan, D. R. Barraclough   +2 more
openaire   +2 more sources

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

Sensitivity of the Geomagnetic Octupole to a Stably Stratified Layer in the Earth's Core

, 2018
Current "Earth-like" numerical dynamo simulations are able to reproduce many characteristics of the observed geomagnetic field. One notable exception is the geomagnetic octupolar component. Here we investigate whether a stably stratified layer at the top
Stanley, Sabine, Yan, Chi
core   +1 more source