| A geomagnetic storm begins with an enormous burst of electrically charged gas, or plasma, from the sun. |
| Therefore the earth's south magnetic pole is located near the geographic north pole and is called the geomagnetic north pole. |
| The determination of geomagnetic polarities in volcanic sequences was carried out in the field using portable fluxgate magnetometers. |
| When geomagnetic activity is low, the aurora typically is located, in the hours around midnight, at about 67 degrees magnetic latitude. |
| The orientation of this magnetic field is crucial for the onset of a geomagnetic storm. |
| For example, at each location on the globe, the geomagnetic field lines intersect the Earth's surface at a specific angle of inclination. |
