In electromagnetics, the term magnetic field refers to two distinct but closely related vector fields: magnetic flux density B and magnetic field intensity H . These fields differ in how they account for the medium and magnetization M . In a vacuum, they are related by B=μ_0 H. In a magnetized material, this relation becomes B=μ_0 (H+M) . Within the framework of the World-Universe Cosmology (WUC), the Cosmic Medium (CM)—comprising protons, electrons, photons, neutrinos, and Universe-Created Particles (UCPs)—acts as a universal agent governing all physical processes and is inherently a magnetized medium. UCPs, conceptualized as DIRAC dipoles formed by Dirac’s magnetic monopoles, possess a magnetic dipole moment proportional to the Bohr magneton. Any local concentration of DIRACs within any material, including CM, induces both a magnetization field M and a magnetic field intensity H . This approach to magnetic fields within WUC offers a framework for explaining a wide range of observed magnetic phenomena, including the dark magnetic field, the large-scale structure of the Milky Way’s magnetic field, and other magnetic effects that are only partially correlated with objects observable in other spectral ranges.