magnetic diurnal variation

Oscillations of the earth’s magnetic field which have a periodicity of about a day and which depend to a close approximation only on local time and geographic latitude. Also known as magnetic daily variation.

Related terms:

• magnetic annual variation
• diurnal variation
• abnormal magnetic variation
• annual magnetic variation
• magnetic daily variation
• magnetic variation
• magnetic survey
• local magnetic disturbance
• secular variation
• Magnetic Anomaly