Geomagnetic field | Definition, Strength, & Facts | Britannica
WEBSep 28, 2024 · Geomagnetic field, magnetic field associated with Earth. It is primarily dipolar (i.e., it has two poles, the north and south magnetic poles) on Earth’s surface. Away from the surface the dipole becomes distorted.
Geomagnetic storm | Solar Wind, Auroras & Magnetosphere
WEB4 days ago · Geomagnetic storm, disturbance of Earth’s upper atmosphere brought on by coronal mass ejections—i.e., large eruptions from the Sun’s outer atmosphere, or corona. The material associated with these eruptions consists primarily of protons and electrons with an energy of a few thousand electron volts.
Geomagnetics | Earth’s Magnetic Field, Magnetism, …
WEBSep 28, 2024 · geomagnetics, branch of geophysics concerned with all aspects of the Earth’s magnetic field, including its origin, variation through time, and manifestations in the form of magnetic poles, the remanent magnetization of rocks, and local or …
Nature of geomagnetic field on the Earth’s surface | Britannica
WEBgeomagnetic field, Magnetic field associated with the Earth. It is essentially dipolar (i.e., it has two poles, the northern and southern magnetic poles) on the Earth’s surface. Away from the surface, the field becomes distorted.
Geomagnetic field - Sources, Steady, Magnetic | Britannica
WEBSep 28, 2024 · In convection, energy is transported by bubbles of hot fluid that rise toward cooler regions, carrying more heat than flows through the same material at rest. Several conditions must be satisfied for the fluid motion to produce a magnetic field. First, the fluid must be electrically conducting.
Geomagnetic field - Dipolar, Earth, Magnetosphere | Britannica
WEBSep 28, 2024 · It is defined as a curve in three dimensions that is everywhere tangential to the local magnetic field. The pattern of field lines created by a bar magnet is called a dipolar field because it has the same shape as the electric field produced by two (di-) slightly separated charges (poles) of opposite sign.
Geomagnetic field - Ionospheric Dynamo, Earth's Core, Magnetic ...
WEBSep 28, 2024 · Geomagnetic field - Ionospheric Dynamo, Earth's Core, Magnetic Reversals: Above Earth’s surface is the next source of magnetic field, the ionospheric dynamo—an electric current system flowing in the planet’s ionosphere.
Coronal mass ejection (CME) | Definition & Effects | Britannica
WEB4 days ago · coronal mass ejection (CME), large eruption of magnetized plasma from the Sun ’s outer atmosphere, or corona, that propagates outward into interplanetary space. The CME is one of the main transient features of the Sun.
Geomagnetic field - Magnetic Reconnection, Earth's Core, Solar …
WEBSep 28, 2024 · Geomagnetic field - Magnetic Reconnection, Earth's Core, Solar Wind: The observed dependence of geomagnetic activity on the orientation of the IMF is explained by most researchers as a consequence of magnetic reconnection. In reconnection, two oppositely directed magnetic fields are brought together …
Geomagnetic field - Measurement, Variation, Reversal | Britannica
WEBSep 28, 2024 · Geomagnetic field - Measurement, Variation, Reversal: Magnetic fields can be measured in various ways. The simplest measurement technique still employed today involves the use of the compass, a device consisting of a permanently magnetized needle that is balanced to pivot in the horizontal plane.