Magnetism and Magnetic Materials

Geomagnetism

Geomagnetism is the study of the dynamics of the Earth's magnetic field that is produced in the inner core. The main geomagnetic field of the earth is produced by the field of electrically charged particles within the liquid part of the earth's core. The geomagnetic field is used to explore the dynamics of Earth's inside and its surrounding space environment, and geomagnetic data are used.

Earth's magnetic field diverts most of the solar radiation, whose charged particles would otherwise strip away the ozone sphere that protects the Earth from harmful ultraviolet radiation. The study of the past magnetic field of the Earth is known as paleomagnetism. The polarity of the Earth's magnetic field is recorded in igneous rocks, and reversals of the sector area unit as detectable as stripes centered on mid-ocean ridges where the sea floor is spreading, while the stability of the geomagnetic poles between reversals has allowed paleomagnetism to trace the past motion of continents. Reversals also give the base for magneto stratigraphy, a way of dating rocks and sediments.