home
Add a piglix
All Activity
piglix
Tags
Categories
Users
About
FAQ

International Geomagnetic Reference Field

The International Geomagnetic Reference Field (IGRF) is a standard mathematical description of the large-scale structure of the Earth's main magnetic field and its secular variation. It was created by fitting parameters of a mathematical model of the magnetic field to measured magnetic field data from surveys, observatories and satellites across the globe. The IGRF has been produced and updated under the direction of the International Association of Geomagnetism and Aeronomy (IAGA) since 1965.

The IGRF models the geomagnetic field ${\vec {B}}(r,\phi ,\theta ,t)$ ${\vec {B}}(r,\phi ,\theta ,t)$ as a gradient of a magnetic scalar potential $V(r,\phi ,\theta ,t)$ $V(r,\phi ,\theta ,t)$

${\vec {B}}(r,\phi ,\theta ,t)=-\nabla V(r,\phi ,\theta ,t)$ ${\vec {B}}(r,\phi ,\theta ,t)=-\nabla V(r,\phi ,\theta ,t)$

...
Wikipedia