The Earth's magnetic field (or geomagnetic field) is an ever-changing phenomenon that influences human activity and the natural world in a myriad of ways. The geomagnetic field changes from place to place, and on time scales ranging from seconds to decades to eons. These changes can affect health and safety, and economic well-being. The geomagnetic field, along with its associated phenomena, can both assist and degrade navigation and surveying techniques; it can impede geophysical exploration; it can disrupt electric power utilities, and pipeline operations; and it can influence modern communications systems, spacecraft, and more.

This web site and its companion website (Space Weather Canada) describe the work of the Canadian Hazard Information Service and the Public Safety Geoscience Program in monitoring and predicting the changes in the geomagnetic field throughout Canada.