";s:4:"text";s:4076:" Our planet's magnetic field is an important part of the defenses that protect us from cosmic radiation and charged particles streaming from the … Away from the surface the dipole becomes distorted. Earth's magnetic field exists thanks to swirling liquid iron in the planet's outer core, some 1,800 miles beneath the surface. The magnetic field of the Earth (geomagnetic field) resembles the field produced by a simple bar magnet. The Earth is composed of layers having different chemical compositions and different physical properties. Geomagnetic field, magnetic field associated with Earth. Magnetic fields such as that of Earth cause magnetic compass needles and other permanent magnets to line up in the direction of the field. It shields the Earth against harmful particles in space.The field is unstable and has changed often in the history of the Earth. The lines of magnetic force flow into Earth in the northern hemisphere and out of Earth in the southern hemisphere. Magnetic field, a vector field in the neighbourhood of a magnet, electric current, or changing electric field, in which magnetic forces are observable. It was generated using data from the European Space Agency's Swarm mission, which is dedicated to studying Earth’s magnetic field from space. At the midpoint between the poles the strength is half of its value at the poles. The strength of Earth’s main magnetic field is currently about 29.5 microteslas, down 5 microteslas, or 14 percent from its strength three centuries ago. Earth's magnetic field is a magnetic field that emanates from Earth's core and encircles the Earth. Magnetic fields force moving electrically charged particles in a circular or helical path. The field is variable, changing continuously, and its poles migrate over time. Scientists studying the phenomenon observed that … The Earth's magnetic field varies depending on your location on the Earth's surface. The north pole of the magnet is near the top of the planet, near the geographic north pole, and the south pole is near the geographic south pole. Earth's magnetic field is vital to life on our planet. Such a field is called a dipole field because it has two poles, located at either end of the magnet, where the strength of the field is maximum. Earth’s magnetic field is defined by the North and South Poles that align generally with the axis of rotation (Figure 9.13). The Earth's magnetic field is weakening between Africa and South America, causing issues for satellites and space craft. The crust of the Earth has some permanent magnetization, and the Earth’s core generates its own magnetic field, sustaining the main part of the field we measure at the surface. It's an ever-changing force that protects us from cosmic radiation – and charged particles from the Sun.