Auroral oval dynamics in relation to solar wind-magnetosphere interaction
Abstract
Photometric observations of dayside auroras are compared with simultaneous measurements of geomagnetic disturbances from meridian chains of observatories on the dayside and on the nightside in order to document the dynamics of dayside auroras in relation to local and global disturbances. These observations are then related to measurements made of the interplanetary magnetic field (IMF) from the satellites ISEE-1 and 3. Dayside auroras are shown to shift equatorward and poleward with the growth and decay of circum-oval/polar cap geomagnetic disturbance and with negative and positive changes in the north-south component of the interplanetary magnetic field. The DP2 mode is identified as the geomagnetic disturbance associated with auroral shift. A model explaining the equatorward and poleward movements of the dayside oval in terms of a dayside current system that is intensified by a southward movement of the IMF vector is proposed.
- Publication:
-
Geophysica Norvegica
- Pub Date:
- 1982
- Bibcode:
- 1982GeoNr..32...77S
- Keywords:
-
- Auroras;
- Earth Magnetosphere;
- Geomagnetism;
- Magnetic Disturbances;
- Solar Terrestrial Interactions;
- Solar Wind;
- Daytime;
- International Sun Earth Explorers;
- Interplanetary Magnetic Fields;
- Magnetopause;
- Polar Regions;
- Spectrophotometry