Characteristics of the development of stimulated and spontaneous magnetospheric substorms according to satellite and ground-based data
Abstract
It is shown that a substorm stimulated by an external disturbance dBz greater than 2 nTl can begin in the case of a magnetic field configuration that is extended only slightly into the tail. For a highly extended configuration, a substorm can develop in the case of slight external disturbances. Five to ten minutes before the substorm commencement, auroral intensity fluctuations can be observed which arise spontaneously. Alternatively, long-period magnetic-field fluctuations can be observed which are excited by a positive offshoot of the Bz component of the IMF.
- Publication:
-
Geomagnetism and Aeronomy
- Pub Date:
- December 1989
- Bibcode:
- 1989Ge&Ae..29..910K
- Keywords:
-
- Earth Magnetosphere;
- Magnetic Disturbances;
- Magnetic Storms;
- Satellite Observation;
- Interstellar Magnetic Fields;
- Nocturnal Variations;
- Solar Wind