Morphology category of geomagnetic storms and characteristics of interplanetary magnetic clouds
Abstract
Six typical geomagnetic storms are analyzed from the aspect of varieties of morphology categories of magnetic storms with sudden commencement caused by interplanetary magnetic clouds. The main conclusions obtained are drawn. The high-density structure in front of magnetic cloud is an important factor in determining the property of the initial phase of geomagnetic storm. Under similar conditions for the magnetic field of magnetic cloud, the velocities of both the background solar wind and the magnetic cloud affect the development and intensity of magnetic storm. The onset and recovery of strong main phase are controlled by the orientation of the field vector inclination with respect to the ecliptic plane. One of the main features of the storm generated from a positive magnetic cloud is the long-delayed main phase. The solar wind streams behind the magnetic cloud keep affecting the recovery of main phase of magnetic storm.
- Publication:
-
Science China Series Mathematics Physics Astronomy Technological Sciences
- Pub Date:
- June 1991
- Bibcode:
- 1991SCSMP..34..717Z
- Keywords:
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- Interplanetary Magnetic Fields;
- Magnetic Clouds;
- Magnetic Storms;
- Solar Terrestrial Interactions;
- Sudden Storm Commencements;
- Geomagnetism;
- Morphology;
- Solar Wind Velocity;
- Astrophysics