Geomagnetic Elements

What is Geomagnetic Elements?

Geomagnetic Elements meaning In solar-terrestrial terms, the components of the geomagnetic field at the surface of the earth. In SESC use, the northward and eastward components are often called the H and D components, where the D component is expressed in gammas and is derived from D (the declination angle) using the small angle approximation.

 

reference: National Weather Service Glossary