When unusually strong surges of solar wind (charged particles from the Sun) hit the Earth. This effect causes variations in the magnetic field which surrounds the Earth. The result are visible aurora (Northern and Southern lights).
magnetic storms on earth caused by solar activity; they cause the auroras, surges in power lines, and interference of radio and TV signal transmissions
a disturbance in Earth's magnetic field triggered by solar activity. Aurorae, power outages, and satellite failures can all be caused by such storms.
A worldwide magnetic disturbance. The term was coined by Alexander von Humboldt (1769-1859). After journeying the length of Siberia, Humboldt convinced the Czar to set up a network of magnetic observatories across the Russian lands, and additional stations were established throughout the British Empire, from Toronto to Tasmania. This network clearly showed that magnetic storms were essentially identical all over the world: a steep decrease of the field over twelve to twenty-four hours, followed by a gradual recovery, which lasted one to four days. The change in the magnetic field was small, but its world-wide scale suggested that something quite big was happening out in space. ( go to first use in the text)
A disruption of the Earth's magnetic field by unusually intense solar winds. Such winds are associated with the ejection of large amounts of high-energy particles from the Sun, typically as a result of a flare, or a coronal mass ejection.
a storm in the magnetosphere
a temporary disturbance of the earths magnetosphere
A large-scale disturbance of the magnetosphere, often initiated by the arrival of an interplanetary shock originating at the Sun. A magnetic storm is marked by the injection of an appreciable number of ions from the magnetotail into the ring current, a process accompanied by increased auroral displays. The strengthened ring current causes a world-wide drop in the equatorial magnetic field, taking perhaps 12 hours to reach its greatest intensity, followed by a more gradual recovery.
A worldwide temporal disturbance of the earth's magnetic field. A storm is defined as occurring when the A index exceeds 29.
A worldwide disturbance of the Earth's magnetic field, distinct from regular diurnal variations.
A worldwide disturbance in the earth’s magnetic field. (TOP OF THE PAGE) (CLOSE WINDOW)
A worldwide disturbance of the Earth's magnetic field, associated with solar activity.
A worldwide large disturbance in the Earth’s magnetic field, accompanied by intense auroras in the northern and southern polar regions and intensifications of the particle radiation trapped in Earth's magnetosphere (the Van Allen belts).
A world-wide disturbance of the Earth magnetic field, associated to solar activity.
A geomagnetic storm is a temporary disturbance of the Earth's magnetosphere. Associated with solar coronal mass ejections (CME), coronal holes, or solar flares, a geomagnetic storm is caused by a solar wind shock wave which typically strikes the Earth's magnetic field 24 to 36 hours after the event. This only happens if the shock wave travels in a direction toward Earth.