Results 271 to 280 of about 21,118 (299)
Some of the next articles are maybe not open access.
Mathematical model of the geomagnetic field for 1965
Journal of Geophysical Research, 1966A mathematical model of the geomagnetic field for 1965.0 is presented. The field is given by internal and external spherical harmonic coefficients to degree and order 12. This model was derived from approximately 425,000 measurements made since 1900. An important step in the derivation was the analytic smoothing of data, which produced the regularly ...
L. Hurwitz +3 more
openaire +1 more source
A Phenomenological Model for Reversals of the Geomagnetic Field
1989We consider a system made by N point interacting dipoles, each of them having a finite lifetime. A renewal process for the dipoles gives the time evolution of the system. When the number N of dipoles is low, and for a wide range of the coupling between the dipoles, we observe sudden transitions or excursions between two polarised states.
Mazaud, A., Laj, C., Bard, E.
openaire +2 more sources
An Overview of Geomagnetic Field Models
1980Abstract : Over the last decade, the utility of geomagnetic field models or the mathematical representations of the geomagnetic field has expanded considerably, both for civilian and military applications. Such an increase has been accompanied with more interest in models and demands for better accuracies with resultant changes in techniques of model ...
openaire +1 more source
Mathematical Methods of Geomagnetic Field Modeling
2017The geomagnetic field, as the Earth’s magnetic field is called, extends from Earth’s interior to outer space. The magnetosphere is the region defined by the areal extent and the shape of the magnetic field of a celestial body, like the planet Earth.
Stavros Kolios +3 more
openaire +1 more source
Operational modelling of geomagnetic fields and geomagnetically induced currents
2022Geomagnetically induced currents (GICs) have long been known to affect power systems adversely. Modelling these GICs usually involves consideration of a chain of coupled systems. The scope of the modelling chain spans multiple disciplines, from solar physics through to geophysics and power engineering.
openaire +1 more source
Models of the geomagnetic field on the territory of the Republic of Macedonia
2008The aim of this paper is to present various geomagnetic field models of Macedonia based on measurements at repeat stations as well as satellite data covering this region. At first a theoretical basis of the geomagnetic field, spherical cap harmonical model and polynomial model will be given.
Panovska, Sanja +3 more
openaire +1 more source
Regional geomagnetic field model for Croatia
2015Geomagnetic components at Croatian repeat stations and ground survey sites, as well as European observatories and repeat stations, were used to obtain a regional geomagnetic model over Croatia at 2009.5 epoch. Different models were derived, depending on input data, and the modelling techniques were Adjusted Spherical Harmonic Analysis and Spherical ...
Vujić, Eugen +3 more
openaire +2 more sources
On The Modeling Of The Regional Geomagnetic Field
2006Cilj rada bio je regionalno modeliranje glavnog magnetskog polja i njegove sekularne promjene primjenom sferne harmoničke analize na kuglinoj kaloti SCHA, tehnike (Spherical Cap Harmonic Analyses). Europsko područje izabrano je za modeliranje, budući je mreža geomagnetskih opservatorija ovdje najgušća.
openaire +1 more source
An Equivalent Source Model for the Geomagnetic Field
2013A new model for the geomagnetic field is presented. It does not rely heavily on the present-day field, which has some ephemeral characteristics, but mostly on paleomagnetic data from lava flows, in particular the large Icelandic data set. The model consists of an axial dipole and vertical off centered dipoles representing the non-axial-dipole field ...
openaire +1 more source